Picture.

3. have been working

4. was playing

5. have bill arrived/ arrived

6. have liked

7. left

8. have had

9. phoned

10. was going/ didn't see

11. have known/ was

12. has finished

13. haven't seen

14. sits/ is sittting ( khác với mọi khi )

15. is snowing/ have ever seen/ doesn't snow

vi

1. The room has been cleaned

2. all flights were cancelled because of the fog

3. the computer is being used at the moment 

4. designer is paid a lot of money

5. these products have to be tested

6. our conversations were being recorded

7. cars left here will be towed away

8. the concert has been postponed

9. bananas are exported to europe

10. flowers can be found in....

vii 

1. of

2. for

3. on

4. after

5. of

6. on

7. of

8. from

viii

1. f

2. t

3. t

4.t