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2.c

3.a

4.composing

5.announcing

6.been

7.invented

8.accompany

9. was giving

10. worry

11.were happened

12.go to

13.to work

14. are we

15.to service

16.been

17.been

18.crossed

III

1.haven't seen

2.write

3.haven't finished

4.had bought

5.be taken

6.arrived

7.was invented

8.would be

9.don't learn

10.seeing

11. to do

12.is used

13.hasn't come

14.will go

15.rainning

16.helps

feels

17.will be

18.practices

19.hasn't seen

20.is swimming

21.haven't begun

22.hates

23.gets up

24.took

25.haven't contacted

26.was

27.drinks

28.rained

29.answering

30.are having

31.hasn't sent

32.playing

33.having

34.listening