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
（责任编辑：）
