Tom earned some money____ babysitting for the couple living next door.
| A．in | B．at | C．by | D．of |
Students ______ remain in their seats until all the exam papers have been collected.
| A．must | B．shall | C．may | D．can |
The atmosphere of the earth ______ us from the strong sun light.
| A．prevents | B．keeps | C．stops | D．protects |
---How well did John do in the match?
--Wonderful. I think we can’t have a ______ player in our football team.
| A．good | B．well | C．better | D．best |
Many countries are increasing their use of natural gas , wind and other forms of ______.
| A．power | B．force | C．energy | D．strength |
The fact that many college graduates get lower pay than some workers has ______ a heated discussion.
| A．set out | B．set about | C．set up | D．set off |