1:  Only with careful environmental planning can we protect the world in which we live.

D.  We can protect the world we live in only with careful environmental planning.

2:  You should take regular exercises instead of sitting in front of the television all day.

A.  Taking regular exercises is better than sitting in front of the television all day.

3:  It was not until after I got home that I realized I had not set the burglar alarm in the office.

C.  I didn’t turn the burglar alarm on before I left the office, but I only became aware of this after I'd arrived home.

4:  He did not remember the meeting. He went out for a coffee with his friends then.

D.  Not remembering the meeting, he went out for a coffee with his friends.

5:  They left their home early. They didn’t want to miss the first train.

C.  They left their home early so as not to miss the first train.

6:  I’m sure Luisa was very disappointed when she failed the exam

B.  Luisa must have been very disappointed when she failed the exam.

7.  “You had better see a doctor if the sore throat does not clear up.” she said to me.

D.  She suggested that I see a doctor if the sore throat did not clear up.

8:  Without her teacher’s advice, she would never have written such a good essay

C.  She wrote a good essay as her teacher gave her some advice.

9.  She tried very hard to pass the driving test. She could hardly pass it.

C.  No matter how hard she tried, she could hardly pass the driving test.

10. Mary loved her stuffed animal when she was young. She couldn’t sleep without it.

A. When Mary was young, she loved her stuffed animal so much that she couldn't sleep without it.

1:  Only with careful environmental planning can we protect the world in which we live.

A.  Careful environmental planning protects the world we live in.

B.  Planning the environment carefully, we can protect the world in which we live.

C.  Protecting the world we live in, we plan the environment carefully.

D.  We can protect the world we live in only with careful environmental planning.

2:  You should take regular exercises instead of sitting in front of the television all day.

A.  Taking regular exercises is better than sitting in front of the television all day.

B.  Sitting in front of the television all day helps you take regular exercises.

C.  Sitting in front of the television all day and taking exercises are advisable.

D.  Don’t take regular exercises, just sit in front of the television all day.

3:  It was not until after I got home that I realized I had not set the burglar alarm in the office.

A.  On the way home, I suddenly realized that I had forgotten to turn on the burglar alarm in the office.

B.  Fortunately, I realized that I hadn't set the burglar alarm just before I left for home; otherwise, I would have had to travel all the way back to the office.

C.  I didn’t turn the burglar alarm on before I left the office, but I only became aware of this after I'd arrived home.

D. I wish I had realized before I arrived home that I hadn't turned on the burglar alarm in the office, then it would have been easier to go and set it.

4:  He did not remember the meeting. He went out for a coffee with his friends then.

A.  Not remember the meeting, he went out for a coffee with his friends.

B.  Not to remember the meeting, he went out for a coffee with his friends.

C.  Not remembered the meeting, he went out for a coffee with his friends.

D.  Not remembering the meeting, he went out for a coffee with his friends.

5:  They left their home early. They didn’t want to miss the first train.

A.  They left their home early so as to not miss the first train.

B.  They left their home early for fear that they wouldn’t miss the first train.

C.  They left their home early so as not to miss the first train.

D.  They left their home early in order that not to miss the first train.

6:  I’m sure Luisa was very disappointed when she failed the exam

A.  Luisa must be very disappointed when she failed the exam.

B.  Luisa must have been very disappointed when she failed the exam.

C. Luisa may be very disappointed when she failed the exam.

D. Luisa could have been very disappointed when she failed the exam.

1:  Only with careful environmental planning can we protect the world in which we live.

D.  We can protect the world we live in only with careful environmental planning.

2:  You should take regular exercises instead of sitting in front of the television all day.

A.  Taking regular exercises is better than sitting in front of the television all day.

3:  It was not until after I got home that I realized I had not set the burglar alarm in the office.

C.  I didn’t turn the burglar alarm on before I left the office, but I only became aware of this after I'd arrived home.

4:  He did not remember the meeting. He went out for a coffee with his friends then.

D.  Not remembering the meeting, he went out for a coffee with his friends.

5:  They left their home early. They didn’t want to miss the first train.

C.  They left their home early so as not to miss the first train.

D.  They left their home early in order that not to miss the first train.

6:  I’m sure Luisa was very disappointed when she failed the exam

B.  Luisa must have been very disappointed when she failed the exam.

Question 1. The young girl has great experience in nursing. She has worked as a hospital volunteer for years.

A. Before she worked as a hospital volunteer for years, the young girl has great experience in nursing.

B. Much as she has worked as a hospital volunteer for years, the young girl has great experience in nursing.

C. Having worked as a hospital volunteer for years, the young girl has great experience in nursing.

D. With great experience in nursing, the young girl has worked as a hospital volunteer for years.

Question 2. Peter told us about his leaving the school. He did it on his arrival at the meeting.

A. Only after his leaving the school did Peter inform us of his arrival at the meeting.

B. Not until Peter told us that he would leave the school did he arrive at the meeting.

C. Hardly had Peter informed us about his leaving the school when he arrived at the meeting.

D. No sooner had Peter arrived at the meeting than he told us about his leaving the school.

Question 3. He was successful because he was determined to pursue personal goals. He was not talented.

A. In addition to his determination, his talent ensured his success in pursuing his goals.

B. His determination to pursue personal goals made him successful and talented.

C. It was his determination to pursue personal goals, not talent, that contributed to his success.

D. His success lay in his natural ability, not in his determination to pursue personal goals.

Question 4. There was a serious flood. All local pupils couldn’t go to school on that day.

A. The serious flood prevented all local pupils not go to school on that day.

B. The serious flood hindered all local pupils from going to school on that day.

C. The serious flood made all pupils from not going to school on that day.

D. The serious flood caused all local pupils not go to school on that day.

Question 5. He did not remember the meeting. He went out for a coffee with his friends then.

A. Not remember the meeting, he went out for a coffee with his friends.

B. Not to remember the meeting, he went out for a coffee with his friends.

C. Not remembered the meeting, he went out for a coffee with his friends.

D. Not remembering the meeting, he went out for a coffee with his friends.

Question 6. They left their home early. They didn’t want to miss the first train.

A. They left their home early so as to not miss the first train.

B. They left their home early for fear that they wouldn’t miss the first train.

C. They left their home early so as not to miss the first train.

D. They left their home early in order that not to miss the first train.

Question 7. My sisters used to get on with each other. Now they hardly speak.

A. My sisters were once close, but they rarely speak to each other now.

B. My sisters do not speak to each other much, but they are good friends.

C. My sisters rarely speak because they have never liked each other.

D. Because they have never got on, my sisters do not speak to each other.

Question 8. The soccer team knew they lost the match. They soon started to blame each other.

A. Not only did the soccer team lose the match but they blamed each other as well.

B. No sooner had the soccer team started to blame each other than they knew they lost the match.

C. As soon as they blamed each other, the soccer team knew they lost the match.

D. Hardly had the soccer team known they lost the match when they started to blame each other.

A. Being friends for years, we find it quite easy to share secrets.

B. We find it quite easy to share secrets, being friends for years.

C. We have been friends so that it is quite easy to share secrets between us.

D. Having been friends for years, we find it quite easy to share secrets between us.

Question 10. I started training to be an accountant six months ago. I’ve got more months to go and then I have to take exams.

A. By the time I’ve taken my exam, I will have started training to be an accountant for a year.

B. By the time I take my exam, I will have been in training to be an accountant for a year.

C. By the time I took my exam, I would have trained to be an accountant for a year.

D. By the time I’ve taken my exam, I will be training for a year.

Question 11. The government knows the extent of the problem. The government needs to take action soon.

A. The government knows the extent of the problem whereas it needs to take action soon.

B. The government knows the extent of the problem so that it needs to take action soon.

C. Knowing the extent of the problem, the government needs to take action soon.

D. The government knows the extent of the problem, or else it needs to take action soon.

Question 12. The substance is very toxic. Protective clothing must be worn at all times.

A. Since the substance is very toxic, so protective clothing must be worn at all times.

B. So toxic is the substance that protective clothing must be worn at all times.

C. The substance is such toxic that protective clothing must be worn at all times.

D. The substance is too toxic to wear protective clothing at all times.

Question 13. I accepted the new job after all. It is making me feel exhausted.

A. Perhaps I shouldn’t have accepted this new job, as it’s making me feel exhausted.

B. Perhaps it would have been better if I hadn’t agreed to this new job since it is so boring.

C. It is of deep regret that I didn’t turn down the job offer due to its hardship and long hour work.

D. If it had not been for my acceptance the new job offer, I wouldn’t have felt exhausted.

Question 14. Since 1970, the United Nations has been celebrating April 22nd as Earth Day. It attracts millions of people worldwide to join in to promote public awareness of environmental protection.

A. Since 1970, the UNs has been celebrating April 22nd as Earth Day because it attracts millions of people worldwide to join in to promote public awareness of environmental protection.

B. The UNs has been celebrating April 22nd as Earth Day, which millions of people worldwide are attracted to join in it to promote public awareness of environmental protection.

C. Since 1970, the UNs has been celebrating April 22nd as Earth Day, which attracts millions of people worldwide to join in to promote public awareness of environmental protection.

D. Since 1970, the UNs has been celebrating April 22nd as Earth Day so that more people join in to promote public awareness of environmental protection.

Question 15. We found the bad weather very inconvenient. We chose to find a place for the night.

A. The bad weather prevented us from driving any further.

B. Bad weather was approaching, so we started to look for a place to stay.

C. Seeing that the bad weather had set in, we decided to find somewhere to spend the night.

D. Because the climate was so severe, we were worried about what we’d do at night.

Question 16. He held the rope with one hand. He stretched it out.

A. The rope is held with one hand then he stretched it out.

B. Stretching the rope out, he holds it with one hand.

C. Holding the rope with one hand, he stretched it out.

D. He stretched the rope with one hand and held it.

Question 17. The plan may be ingenious. It will never work in practice.

A. Ingenious as it may be, the plan will never work in practice.

B. Ingenious as may the plan, it will never work in practice.

C. The plan may be too ingenious to work in practice.

D. The plan is as impractical as it is ingenious.

Question 18. I never received the letter. It was sent to the wrong address.

A. Since it was sent to the wrong address, I have never received the letter.

B. I never received the letter because it was sent to the wrong address.

C. I never received the letter because of sending to the wrong address.

D. Sent to wrong address, I never received the letter.

Question 19. In your country, schools are open to all. They accept children of any race, colour or creed.

A. In our country, schools are open to all children irrespective of race, colour or creed.

B. In our country, schools are open to all children except for race, colour or creed.

C. Apart from race, colour or creed, schools are open to all children in your country.

D. Children of any race, colour or creed can be admitted to our schools when they are opened.

Question 20. He felt very tired. He was determined to continue to climb up the mountain.

A. He felt so tired that he was determined to continue to climb up the mountain.

B. Feeling very tired, he was determined to continue to climb up the mountain.

C. Tired as he might, he was determined to continue to climb up the mountain.

D. As a result of his tiredness, he was determined to continue to climb up the mountain.

Question 1. The young girl has great experience in nursing. She has worked as a hospital volunteer for years.

A. Before she worked as a hospital volunteer for years, the young girl has great experience in nursing.

B. Much as she has worked as a hospital volunteer for years, the young girl has great experience in nursing.

C. Having worked as a hospital volunteer for years, the young girl has great experience in nursing.

D. With great experience in nursing, the young girl has worked as a hospital volunteer for years.

Question 2. Peter told us about his leaving the school. He did it on his arrival at the meeting.

A. Only after his leaving the school did Peter inform us of his arrival at the meeting.

B. Not until Peter told us that he would leave the school did he arrive at the meeting.

C. Hardly had Peter informed us about his leaving the school when he arrived at the meeting.

D. No sooner had Peter arrived at the meeting than he told us about his leaving the school.

Question 3. He was successful because he was determined to pursue personal goals. He was not talented.

A. In addition to his determination, his talent ensured his success in pursuing his goals.

B. His determination to pursue personal goals made him successful and talented.

C. It was his determination to pursue personal goals, not talent, that contributed to his success.

D. His success lay in his natural ability, not in his determination to pursue personal goals.

Question 4. There was a serious flood. All local pupils couldn’t go to school on that day.

A. The serious flood prevented all local pupils not go to school on that day.

B. The serious flood hindered all local pupils from going to school on that day.

C. The serious flood made all pupils from not going to school on that day.

D. The serious flood caused all local pupils not go to school on that day.

Question 5. He did not remember the meeting. He went out for a coffee with his friends then.

A. Not remember the meeting, he went out for a coffee with his friends.

B. Not to remember the meeting, he went out for a coffee with his friends.

C. Not remembered the meeting, he went out for a coffee with his friends.

D. Not remembering the meeting, he went out for a coffee with his friends.

Question 6. They left their home early. They didn’t want to miss the first train.

A. They left their home early so as to not miss the first train.

B. They left their home early for fear that they wouldn’t miss the first train.

C. They left their home early so as not to miss the first train.

D. They left their home early in order that not to miss the first train.

Question 7. My sisters used to get on with each other. Now they hardly speak.

A. My sisters were once close, but they rarely speak to each other now.

B. My sisters do not speak to each other much, but they are good friends.

C. My sisters rarely speak because they have never liked each other.

D. Because they have never got on, my sisters do not speak to each other.

Question 8. The soccer team knew they lost the match. They soon started to blame each other.

A. Not only did the soccer team lose the match but they blamed each other as well.

B. No sooner had the soccer team started to blame each other than they knew they lost the match.

C. As soon as they blamed each other, the soccer team knew they lost the match.

D. Hardly had the soccer team known they lost the match when they started to blame each other.

A. Being friends for years, we find it quite easy to share secrets.

B. We find it quite easy to share secrets, being friends for years.

C. We have been friends so that it is quite easy to share secrets between us.

D. Having been friends for years, we find it quite easy to share secrets between us.

Question 10. I started training to be an accountant six months ago. I’ve got more months to go and then I have to take exams.

A. By the time I’ve taken my exam, I will have started training to be an accountant for a year.

B. By the time I take my exam, I will have been in training to be an accountant for a year.

C. By the time I took my exam, I would have trained to be an accountant for a year.

D. By the time I’ve taken my exam, I will be training for a year.

Question 11. The government knows the extent of the problem. The government needs to take action soon.

A. The government knows the extent of the problem whereas it needs to take action soon.

B. The government knows the extent of the problem so that it needs to take action soon.

C. Knowing the extent of the problem, the government needs to take action soon.

D. The government knows the extent of the problem, or else it needs to take action soon.

Question 12. The substance is very toxic. Protective clothing must be worn at all times.

A. Since the substance is very toxic, so protective clothing must be worn at all times.

B. So toxic is the substance that protective clothing must be worn at all times.

C. The substance is such toxic that protective clothing must be worn at all times.

D. The substance is too toxic to wear protective clothing at all times.

Question 13. I accepted the new job after all. It is making me feel exhausted.

A. Perhaps I shouldn’t have accepted this new job, as it’s making me feel exhausted.

B. Perhaps it would have been better if I hadn’t agreed to this new job since it is so boring.

C. It is of deep regret that I didn’t turn down the job offer due to its hardship and long hour work.

D. If it had not been for my acceptance the new job offer, I wouldn’t have felt exhausted.

Question 14. Since 1970, the United Nations has been celebrating April 22nd as Earth Day. It attracts millions of people worldwide to join in to promote public awareness of environmental protection.

A. Since 1970, the UNs has been celebrating April 22nd as Earth Day because it attracts millions of people worldwide to join in to promote public awareness of environmental protection.

B. The UNs has been celebrating April 22nd as Earth Day, which millions of people worldwide are attracted to join in it to promote public awareness of environmental protection.

C. Since 1970, the UNs has been celebrating April 22nd as Earth Day, which attracts millions of people worldwide to join in to promote public awareness of environmental protection.

D. Since 1970, the UNs has been celebrating April 22nd as Earth Day so that more people join in to promote public awareness of environmental protection.

Question 15. We found the bad weather very inconvenient. We chose to find a place for the night.

A. The bad weather prevented us from driving any further.

B. Bad weather was approaching, so we started to look for a place to stay.

C. Seeing that the bad weather had set in, we decided to find somewhere to spend the night.

D. Because the climate was so severe, we were worried about what we’d do at night.

Question 16. He held the rope with one hand. He stretched it out.

A. The rope is held with one hand then he stretched it out.

B. Stretching the rope out, he holds it with one hand.

C. Holding the rope with one hand, he stretched it out.

D. He stretched the rope with one hand and held it.

Question 17. The plan may be ingenious. It will never work in practice.

A. Ingenious as it may be, the plan will never work in practice.

B. Ingenious as may the plan, it will never work in practice.

C. The plan may be too ingenious to work in practice.

D. The plan is as impractical as it is ingenious.

Question 18. I never received the letter. It was sent to the wrong address.

A. Since it was sent to the wrong address, I have never received the letter.

B. I never received the letter because it was sent to the wrong address.

C. I never received the letter because of sending to the wrong address.

D. Sent to wrong address, I never received the letter.

Question 19. In your country, schools are open to all. They accept children of any race, colour or creed.

A. In our country, schools are open to all children irrespective of race, colour or creed.

B. In our country, schools are open to all children except for race, colour or creed.

C. Apart from race, colour or creed, schools are open to all children in your country.

D. Children of any race, colour or creed can be admitted to our schools when they are opened.

Question 20. He felt very tired. He was determined to continue to climb up the mountain.

A. He felt so tired that he was determined to continue to climb up the mountain.

B. Feeling very tired, he was determined to continue to climb up the mountain.

C. Tired as he might, he was determined to continue to climb up the mountain.

D. As a result of his tiredness, he was determined to continue to climb up the mountain.

nêu phương pháp phân các dung dịch trong suốt không màu sau:

rượu etylic, dấm ăn 5%, nước vôi trong

có rồi nha bạn ko cần nhắc lại đâu tks nha

1. Không đưa câu hỏi linh tinh lên diễn đàn, chỉ đưa các bài mà mình không giải được hoặc các câu hỏi hay lên diễn đàn;

2. Không trả lời linh tinh, không phù hợp với nội dung câu hỏi trên diễn đàn.

3. Không "Đúng" vào các câu trả lời linh tinh nhằm gian lận điểm hỏi đáp.

Các bạn vi phạm 3 điều trên sẽ bị giáo viên của Online Math trừ hết điểm hỏi đáp, có thể bị khóa tài khoản hoặc bị cấm vĩnh viễn không đăng nhập vào trang web.

Cô ơi làm các chuyên đề tổng ôn song song luyện đề vầy được không ạ?

cảm ơn online math mà cho em hỏi em đang học lớp bảy vậy khi em lên lớp mười có đc nhận nữa ko

mong cô trả lời 

sao các giáo viên dạo này ko trả lời cho học sinh nữa ạ

Các bạn ở tất cả các khối lớp có thể đặt câu hỏi cho thầy Đông nhé. Thầy Đông từng đạt giải Ba Toán quốc gia hồi thầy là học sinh THPT. 

Thưa Admin, em chưa làm gì hết mà sao Admin lại trừ điểm của em

Lại không cho em đăng câu hỏi khi em cần thiết

Mong Admin xem xét lại ạ

thank cô!! Em có thể dùng nó cho bài thuyết trình của mình rồi!

chắc sẽ zui lắm đây , chắc em cũng phải thi

Trông giống bài thi IELTS lắm ạ, phải cần cù học English mới làm được. Em học English kém về từ vựng lắm, chắc không làm được cái này.

- Chia sẻ những khó khăn trong giao tiếp, ứng xử với các thầy cô: 

- Thưa cô em hay ngại khi giao tiếp với người lạ, đặc biệt là như bạn mới quen ở lớp mới.

- Chuyên gia: 

+ Em có thể nới lỏng sự lo sợ của mình. 

+ Hãy thử đến bên bàn của bạn mới và nói chào cậu, tớ là Lan rất vui được làm quen với cậu. 

+ Hoặc là tớ thích bím tóc của cậu,.. rất nhiều cách làm quen em có thể áp dụng.

- Thưa cô em hay ngại khi giao tiếp với thầy cô:

- Chuyên gia: Thầy cô luôn sẵn sàng giúp em giải đáp mọi thắc mắc nên em đừng ngại nha. Sự giao tiếp giữa cô trò sẽ giúp hai người hiểu nhau hơn.

We are living in the modern world and we have to face serious problems about the environment. One of the prominent problems is air pollution. 2020 is an alarming year for heavy air pollution. Hanoi and Ho Chi Minh City- the 2 big cities, the problem of air pollution is even more clear. Industries in Vietnam are growing day by day, leading to untreated exhaust gas being discharged. This is the main cause of air pollution. In addition, the causes of air pollution can be mentioned such as traffic, military activities, agricultural activities, etc. Air pollution directly affects the health of humans and animals. As an indirect cause leading to global warming, it is a direct cause of dangerous human diseases such as respiratory tract cancer.  To sum up, human activities and natural disasters are the main causes of air pollution. We have to take measures to protect the environment properly.

Nowadays, air pollution is a common concern worldwide. It is a cause of damage to the environment and health. Some air pollution comes from natural sources like wild fires => wildfires (1 word only), volcanic eruptions, and so on. But most air pollution from humans such as industrial chemicals, dust, toxic gases which result in climate change, global warming, acid rain and can affect human health. In Vietnam, especially in big cities like Hanoi and Ho Chi Minh city, the total amount of dust is continually increasing. The sources of air pollution is => in (preposition) large urban areas are mostly traffic emissions, road building, and factories. Air pollution is a cause of high blood pressure, birth defects, lung cancer, and others. To protect the air environment we should: 

- Reduce emissions from cars by walking, cycling, or using public transport.

- Plant trees as more as we can.

- Protect natural resources.

- Keep a clean environment.

It is very important to reduce air pollution. When we protect the air environment, we are protecting ourselves and our future.

The problems with pollution in the nearly that have become so serious. I think the major cause of this phenomenon is our human activity. This is a hot topic not only in Vietnam but for all countries around the world. Because it was damage to the environment and health. Moreover, we have only one Earth to live in. So how we improve this bad environmental condition? In this essay, I will suggest some possible solutions to this issue.

First, we need to reduce the number of transports by encouraging the use of public transports. This could be managed through cooperation between governments and individuals. For illustration, governments could ensure that public transport is more affordable and convenient for the general public, then there will many people use this type of transport.

Another solution is to improve our education about environments. I want to say that both parents and schools should teach children about the meaning and importance of protecting the environment. Also, the governments should introduce laws to limit the deforestation in many countries around the world to ensure that there are enough green forests, which helps the air be cleaner. That also means we have to protect natural resources, we need to limit the overexploitation and indiscriminate exploitation of natural resources. In addition, we have to limit littering indiscriminately, which discharged into the environment every day.

Finally, let's join together to contribute to making the green environment more beautiful.

cảm ơn cô :333

cảm ơn cô

cảm ơn cô nha