1. C

2. A

3. D

4. A

5. D

6. C

7. A

8. B

9. C

10. A

11. C

12. D

13. C

14. A

15. A

16. D

17. A

18. A

19.A

20. B

1c apply

2a children

3d measure

4a lived

5d would live

6c solar

7a because

8b does he

9c which

10a given up

11c our usual ways of doing things

12d they save time and energy

13c toilet

14a routine make us unable to create things or to have new ideas

15a our lives could be changed if we changed our routines

16d the books must be returned by this friday

17a in spite of not having experienced,he got the job

18a the teacher asked me if I was having  a wonderful time there

19a it's necessary that we build a water tank to stove water

20b I suggest raising fund to help the poor