нужно
(дала бы больше, если бы не люди которые ударяются головой об клавиатуру, и получают все балы)

Объяснение:

1 задание.

6.have been

7.for

8.have already met

9. have only known

10. for

11. had studied

12. for

13. never had

14. have never had

15.for

16. didn't feel

2 задание

2.My mum has had this watch since she was forty.

3. I Have known my best friend for two years.

4.I haven't bought any new trainers since last Christmas.

5.I Have been in this Englisch class for Three months.

6.I haven't eaten anything since 7a.m.