4 . Solar energy is both plentiful and clean.

5 . The exercises which you asked me to do are very difficult.

6 .The room which I can't see anything is so dark. (S vật+which +S)

7. The sound is to low for us to hear.

8 . The table isn't light enough for the boy to lift

enough: S + tobe + adj + enough + ( forO) + toV

9 . The car is very old because of he can't afford to buy a new one.

10 . They went out in spite of the heavy rain.

11. The cake is too hard for him to eat.(sothat/ because/ such)

=> The cake was so hard that I couldn’t eat it

12. The children couldnt go swimming because the sea was rough.(too/ enough/ so)

=> The sea was too rough for the children to go swimming.

13. Cars cause pollution. People still want them.( aithough)

=>  Despite the fact that cars cause pollution, people want them.

Giải thích : despite the fact that = although: mặc dù

14. The restaurant is so dirty that noone wants to eat there.(such/enough/too/because)

=> It is such a dirty restaurant that no wants to eat there.

15.I cant go with you . I have a lot of work to do.(so/ because of)

=> .I cant go with you because of I have a lot of work to do.

16. They arrived very late. They didnt see the beginning of the film.( sothat/ too)

=> If they had not had a flat tire so that they would not have arrived very late.

17. It was an expensive car. We couldnt afford tobuy it.(sothat/ such)

=> : It's such an expensive car that We don’t think we can buy it

18. There were few people at the meeting. It was cancelled.(sothat/ because)

=> 

There were  so few people at the meeting that it was cancelled.

19. We couldnt understand her because she spoke too fast.( therefore/ enough)

=>  The lecturer spoke too quickly for them to understand.

1.  These problems are very difficult. Nobody can solve them

.…These problems are so difficult that nobody can solve them………………………………………………..……

2.  The house is very small. We can’t live in it.

……The house is so small that we can’t live in it.…………………………………………………………….

3.  This pupil is very smart. He always gets good marks

.… This pupil is so smart. that he always gets good marks……………………………………………………

4.  The weather is too bad. I have to stay at home.

……The weather is so bad that I have to stay at home…………………………………………………………...

5.  The food was very good. They finished it up in just a few minutes

.……The food was so good that they finished it up in just a few minutes………………………………………..

6.  Lan was very busy. She couldn’t go to the movies with us.

………Lan was so busy that she couldn’t go to the movies with us.…………………………………………….

7.  The questions are very easy. Most students can answer them.

…………The questions are so easy that most students can answer them.……………………………….……….

8.  This film was so interesting. We all wanted to see it again.

………This film was so interesting that we all wanted to see it again.……………………………………..……….

Combine the following sentences using the given words in the brackets.
1. He drove very fast. He had an accident. (Because of)

=>Because of driving very fast,he had an accident
2. This problem is very difficult, We can't solve it now. (so)

=> This problem is very difficult, so We can't solve it now.
3. The girl is very beautiful. Her dress is red. (whose)

=>The girl is very beautiful whose dress is red.
4. She learns English well. She plays sports well, too. (not only...but also)

=>She not only learns E well,but also plays sports well
5. She is intelligent. She can do this exercise by herself. (enough)

=>she is intelligent enough to do this exercise by herself

#Fix

3. The girl is very beautiful. Her dress is red. (whose)

The girl whose dress is red is very beautiful.

4. She learns English well. She plays sports well, too. (not only...but also)

Not only does she learn English well but she also plays sports well.

1. The coffee is too hot to drink it

2. The coat is too short to wear it.

3. The food was too hot to eat 

4. This exercise is too difficult to do it

5. The suitcase is too heavy to carry it upstairs.

6. Peter is too young to take of himself.

1. The coffee is extremely hot. I can’t drink it.

\(\rightarrow\) The coffee is too hot to drink.

2. The coat is very short. He can’t wear it.

\(\rightarrow\) The coat is too short to wear.

3. We couldn’t eat the food. The food was extremely hot.

\(\rightarrow\) The food was too hot to eat.

4. We can’t do this exercise. This exercise is very difficult.

\(\rightarrow\) This exercise is too difficult to do.

5. The suitcase is very heavy. Nobody can carry it upstairs.

\(\rightarrow\) The suitcase is too heavy to carry.

6. Peter is very young. He can’t take care of himself.

\(\rightarrow\) Peter is too young to take care of himself.

46. The scientists are looking for a cheaper way to use solar energy to hear air and water.

47. Solar units are expensive.

48. Students learn to build their own solar collectors at universities and colleges.

49. Yes, I do. I think solar energy is expensive.

50. I think so because the solar panels are complicated and difficult to make. So, to make a lot, they’ll need to spend a lot of time, equipment, materials, and energy to produce these panels.

Put the following words in the correct order to make meaningful sentences. Add commas if it is necessary.

1. more/because/people/cheap/solar/should/it/unlimited/use/and/energy/clean/is.

PEOPLE SHOULD USE SOLAR ENERGY MORE BECAUSE IT IS UNLIMITED, CHEAP AND CLEAN.

2. she/is/aunt/although/lives/my/poor/happily.

Although my aunt is poor, she lives happily.

3. is/driving/dangerous/fast/very.

DRIVING FAST IS VERY DANGEROUS.

4. live/many/the/people/country/prefer/in/to.

MANY PEOPLE PREFER TO LIVE IN THE COUNTRY.

5. traffic/are/rush-hours/always/there/fams/during.

THERE ARE ALWAYS TRAFFIC JAMS DURING RUSH-HOURS

1 , people should use more solar energy because it is unlimited cheap and clean

2,Although , my aunt is poor , she lives happily

3,Driving fast is very dangerous

4,Many people prefer to live in the country

5,There are always traffic jams during rush -hours

Chúc bạn học tốt ,cho mik 1 tick nha

1. We could do the test . It was very difficult (although)
=> Although the test was very difficult , we could do it

2.Tom couldn't go too school. He was ill ( so...that)
=> Tom was ill so that he couldn;t go to school

3.Solar anergy is cheap . It is also clean ( not only ... but also )
=> Solar energy is not only cheap but also clean

4. They arrived very late . They didn't see the beginning of the film (so...that)
=> They arrived very late so that they didn't see the beginning of the film

5.It was an expensive car . We couldn't afford to buy it(such)
=> It was such an expensive car that we couldn't afford to buy

6. There was few people at the meeting . It was cancelled(because)
=> The meeting was cancelled because there was few people at this

7.. We couldn't understand her because she spoke too fast (Therefore)
=> She spoke too fast,therefore we couldn;t understand her

8.I've meet too many people. I can't remember all their name (because)
=> I can't remember all their name because I've meet too many people

9. These exercise are very difficult . She can't do them (such...that)
=> These are such difficult exercise that she can't do them

10. It rained heavily . They went to school(despite)
=> Depite rainning heavily, they went to school

11. I can't go with you . I have a lot of work to do(Because of)
=> Because of having a lot of working, I can't go with you

1. We could do the test . It was very difficult (although)
Although the test was very difficult, we could do it

2.Tom couldn't go too school. He was ill ( so...that)
Tom was so ill that he couldn't go to school

3.Solar anergy is cheap . It is also clean ( not only ... but also )
Not only is solar energy cheap but it also clean

4. They arrived very late . They didn't see the beginning of the film (so...that)
They arrived so late that they didn't see the beginning of the film

5.It was an expensive car . We couldn't afford to buy it(such)
Such an expensive car ! We couldn't afford to buy it

6. There was few people at the meeting . It was cancelled(because)
It was cancelled because there was few people at the meeting

7.. We couldn't understand her because she spoke too fast (Therefore)

8.I've meet too many people. I can't remember all their name (because)
I can't remember all people name because I've met too many people

9. These exercise are very difficult . She can't do them (such...that)
It's such a difficult exercise that she can't do them

10. It rained heavily . They went to school(despite)
Despite heavy rain, they went to school

11. I can't go with you . I have a lot of work to do(Because of)
Because of doing a lot of work, I can't go with you

I. Give the correct form of the words in brackets.

1. Solar domestic heating systems are (economy) _____economic______ to use

2. We should use solar energy. it is cheap, clean and (limit) _________unlimited_______

3. If you don't pay your (electric) _____electricity____ bill soon, you will be cut off

4. In the future, many building will be (hot) _______heated______ by solar energy

5. His office is on the (twelve) ______twelfth_____ floor of this building

6. Televisionj is one of the cheapest forms of (entertain) ______entertainment______

7. I get used to (get) ____getting______ up early and having a bath

8. She is a 15 (year) _____year_____ school girl

9. I am going to some French - (speak) _____speaking______ countries

10. This (mix) ______mixture_______ consists of oxigen and hidrogen

1. I can't put up with the horrible traffic in big cities.

2.  It was thought that the stars would fall on ancient people.

3. I used to go to the local park every Saturday afternoon when I was a child

4. When Lang Lieu brought special cakes that he made, the King was very happy.