Complete the sentences with because/ as/ since/ or so.
1. We decided to go out to eat _______ we had no food at home.
2. He has a very important job _______ he is particularly well-paid.
3. No one was watching the television, _______ I switched it off.
4. _______ she changed a lot, we didn’t recognize her.
5. Mathew went to bed _______ it was too late to go out.
6. ________the weather was bad, they delayed their trip.
7. He wants to buy a new car _______ he saves up.
8. I can’t drive fast _______ the street is very crowded.
Match a half-sentence in column A with a half-sentence in column B to make a meaningful sentence.
A B
1. If people use public transport, a. I can’t sleep.
2. You’ll learn English more easily b. will you give her flowers?
3. If they don’t give him the job, c. if he does exercise regularly.
4. If I drink coffee at night, d. I don’t know what he will do.
5. You will speak English well e. there will be less pollution
6. If you see her f. if someone enters the building.
7. The alarm goes off g. if you have more practice.
8. Henry may lose weight h. if you study a little every day.
11. He wants to find a job, _________ he had no luck.
A. but B. so C. as D. if
12. Solar energy doesn’t cause __________.
A. pollution B. polluted C. pollute D. pollutant
13. Are you looking forward ___________ my letter?
A. to receive B. to receiving C. received D. receiving
14. "___________” means a piece of land full of rubbish.
A. junkyard B. treasure C. hedge D. stream
15. Dynamite _________ many years ago.
A. has invented B. invented C. was invented D. were invented
16. Mary said to me "Can you speak English?” In reported speech the sentence will be: She asked me _________
A. if I can speak English B. if I could speak English. C. If can I speak English D. If I could speak English?
17. I live very far from school. I wish________
A. I lived far from school. B. I lived close to school. C. I live near the school now. D. I don’t live very far from school
18. If he __________ hard today, can he have a holiday tomorrow?
A. works B. will work C. worked D. would worked
19. Because there _________ no buses, we had to take a taxi.
A. are B. is C. was D. were
20. We plan to ________ this Saturday.
A. go hiked B. go hiking C. go to hike D. go hike
21. I’ll have to buy a map _________ I don’t know this area.
A. if B. because C. when D. because of
22. It is recommended that he __________ this course.
A. took B. takes C. take D. taking
23. He’s running so fast. I __________ catch up with him.
A. cannot hardly B. can hardly C. not hardly D. could hardly
24. It is important that he _________ take the final examination.
A. has to B. have to C. had to D. having to
25. I will be __________if she manages to sell that motorbike at a high price.
A. surprised B. surprise C. surprising D. to surprise
26. Unless you understand. I __________ explain it again to you
A. am B. was C. will D. would
27. If you know where she lives, please let me__________
A. know B. knew C. known D. to know'
28. If he ______ a student, he will get a discount.
A. were B. was C. were D. will be
29. ______ you are interested in this film, don't go to see it at any cost.
A. Unless B. If C. Because D. So
30. If you like that book, I will give it______you as my present.
A. to B. from C. at D. for
31. If you are busy, we ________ this by ourselves.
A. will do B. did C. would do D. doing
32. How about ______ dinner with us on Sunday?
A. to have B. have C. have had D. having
33. My brother is very fond of ______ to pop and rock music.
A. listen B. to listen C. listening D. listens
34. Life today is very different ______ life 50 years ago.
A. to B. from C. with D. at
35. My uncle is a ______. He often does research in his laboratory
. A. science B. scientist C. scientific D. scientists
36. My father arrives in Singapore ______Monday evening.
A. in B. at C. from D. on
37. John goes to his office every day except Sunday. ______ Sundays he stays at home.
A. On B. At C. In D. From
38. I hope the weather will be nice ______ the weekend.
A. in B. to C. at D. between
39. Would you like ______ to a party on Saturday?
A. come B. coming C. to come D. will come
40. If you don’t study hard , you ______ the exam.
A. failed B. will fail C. fail D. have failed
Choose the best option to complete each of the following sentences. 1. Can you turn ________the light? -It’s too dark.
A. on B. off C. in D. for
2. I suggest ________showers instead of taking a bath.
A. take B. taking C. to take D. to taking
3. - What are you looking ________? - My picture book. I’ve lost it.
A. on B. off C. in D. for
4. A new air-conditioner will be ________tomorrow morning.
A. to install B. installed C. installing D. install
5. Scientists are looking for an ________way to reduce energy consumption.
A. effect B. effection C. effective D. effectively
6. They are completely short of water now. A number of people have died because of this ________.
A. shortage B. short C. shorten D. shortly
7. If you want to save money, you should ________the amount of water your family uses.
A. increase B. reduce C. adapt D. repair
8. In order to save electricity, an ordinary 100-watt light bulb can be replaced by a(n) ________.
A. energy-saving bulb B. energy-save bulb C. saving energy bulb D. save-energy bulb
9. You should get a (n)________to make sure there are no cracks in the pipes.
A. plumber B. mechanic C. electrician D. consumer
10. ________take the train instead of the bus? It’s faster and cheaper.
A. Why not B. Why don’t C. How about D. Let’s
11. If we ________less paper, we ________the number of trees in the forests.
A. used/ will save B. use/ can save C. can use/ save D. use/ can
12. She won’t take all the suitcases ________she likes to travel light.
A. so B. but C. because D. therefore
13. She is very tired; ________, she has to finish her homework.
A. moreover B. so C. and D. however
14. - Is he an actor ________a singer? - An actor
A. and B. or C. with D. so
15. He was tired, ________he took a rest before continuing the work.
A. so B. and C. but D. if
16. Who looks ________your children when you are away from home?
A. for B. at C. after D. to
17. Why doesn’t she go ________with her university study?
A. in B. at C. to D. on
18. After coming home, she cleaned the floor ________cooked dinner.
A. but B. however C. moreover D. and
19. They didn’t understand the matter ________she didn’t ask for help.
A. but B. however C. moreover D. and
20. How about ________posters on energy saving and hanging them around our school?
A. make B. making C. to make D. to making
. Choose the best option to complete each of the following sentences.
1. Can you turn ________the light? -It’s too dark. A. on B. off C. in D. for 2. I suggest ________showers instead of taking a bath. A. take B. taking C. to take D. to taking 3. - What are you looking ________? - My picture book. I’ve lost it. A. on B. off C. in D. for 4. A new air-conditioner will be ________tomorrow morning. A. to install B. installed C. installing D. install 5. Scientists are looking for an ________way to reduce energy consumption. A. effect B. effection C. effective D. effectively 6. They are completely short of water now. A number of people have died because of this ________. A. shortage B. short C. shorten D. shortly 7. If you want to save money, you should ________the amount of water your family uses. A. increase B. reduce C. adapt D. repair 8. In order to save electricity, an ordinary 100-watt light bulb can be replaced by a(n) ________. A. energy-saving bulb B. energy-save bulb C. saving energy bulb D. save-energy bulb 9. You should get a (n)________to make sure there are no cracks in the pipes. A. plumber B. mechanic C. electrician D. consumer 10. ________take the train instead of the bus? It’s faster and cheaper. A. Why not B. Why don’t C. How about D. Let’s 11. If we ________less paper, we ________the number of trees in the forests. A. used/ will save B. use/ can save C. can use/ save D. use/ can 12. She won’t take all the suitcases ________she likes to travel light. A. so B. but C. because D. therefore 13. She is very tired; ________, she has to finish her homework. A. moreover B. so C. and D. however 14. - Is he an actor ________a singer? - An actor A. and B. or C. with D. so 15. He was tired, ________he took a rest before continuing the work. A. so B. and C. but D. if 16. Who looks ________your children when you are away from home? A. for B. at C. after D. to 17. Why doesn’t she go ________with her university study? A. in B. at C. to D. on 18. After coming home, she cleaned the floor ________cooked dinner. A. but B. however C. moreover D. and 19. They didn’t understand the matter ________she didn’t ask for help. A. but B. however C. moreover D. and 20. How about ________posters on energy saving and hanging them around our school? A. make B. making C. to make D. to making
1. Khi nào thì máy phát tạo ra dòng điện xoay chiều ?
2.Cho biết một số cách làm quay roto của máy phát điện trong kĩ thuật. Lấy ví dụ một số cách sản xuất điện xoay chiều và cho biết sự chuyển hóa năng lượng trong trường hợp đó.
3.Đánh dấu x vào ô đúng hoặc sai cho phù hợp.
a. Dòng điện xoay chiều rất giống dòng điện một chiều của pin hay acquy. b. Dòng điện xoay chiều và dòng điện một chiều đều có tác dụng nhiệt c. Máy phát điện xoay chiều là máy biến cơ năng thành điện năng. d. Các nhà máy thủy điện, nhiệt điện đều sinh ra dòng điện xoay chiều. e. Máy phát điện là một trong những ứng dụng quan trọng của hiện tượng cảm ứng điện từ. f. Stato của động cơ điện dùng trong công nghiệp là nam châm vĩnh cửu Đúng hay Sai?