Verified answer

3

1 yet

2 since

3 still

4 yet

5 just

6 still

7 already

8 for

4

1 How long have you studied English?

2 I haven't visited the USA yet.

3 He has just given an interview.

4 They have lived in Canada since 2015.

5 I still haven't met your brother.

6 They have lived here for twenty years.