1) bought

2)has had

3)arrived/had/went

4)Did you visit

5)has taken

6)when did you give up smoking?

7)didn’t eat/didn’t feel

8)why didn’t Jim want to play tennis last night?

9)Have you washed it?

10)has gone/when did exactly he go out?

21.2

1)I have been ill twice so far this year

2)How many times were you ill last year?

3)I haven’t drunk any coffee so far today

4)He has been late three times this week

5)How many games did the team win last season?

6)How many games has the team won so far this season?

21.3

1) worked

2)has lived

3)they have been

4)was

5)has been

6)I never met

7) I have never met him