參考答案： 1. keeping up with the rest of the class.

2. none of us expected the chairman to turn up

3. as was to be expected

4. an art as it is a science

5. could have made a good salary.

6. to have no access

7. to students’ being late for

8. ranges/varies from 50 cents to $4

9. to reserve a table for

10. to make trouble

11. at intervals

12. injure himself

13. busy preparing for

14. had to be operated manually

15. needn’t have borrowed it from the bank.

16. shall have left for

17. is often a very time-consuming job

18. something was done/some measures were taken

19. overcame it/got over it

20. in the way

21. had interrupted me

22. it is because she is too inexperienced

23. caught him cheating me

24. did not work in the same office

25. was finally called off/cancelled because of the bad weather

26. will be doing/conducting the experiment

27. has a strong influence on