15. has lived - was

16. have ever seen

17. has been

18. rained - had been

19. have already chosen

20. Have you paid

III. Choose the best answer

1. B. for

2. B. for

3. C. has worked

4. C. Have

5. B. known

6. B. How long

7. B. have lost

8. D. has been

9. A. have never

10. D. since

Exercise:

I. Complete the sentences with for and since

1. for

2. since

3. since

4. for

5. for

6. since

7. since

8. for

9. for

10. since

11. since

12. for

13. for

14. since

15. for

16. since

17. for

18. for

19. since

20. for

II. Put the verbs into the present perfect tense:

1. have lived

2. has studied

3. have come

4. has already read

5. has just visited

6. have never seen

7. Have you ever talked

8. Has he ahd

9. haven't seen

10. has worked

11. have built

12. haven't been

13. has won

14. has visited