1 . They________ every means, but the engine ________work.

A．tried; couldn’t	B．have tried; won’t
C．tried; won’t	D．have tried; can’t

2 . — Why don’t you enter the office? They are waiting for you.
— The door ________ open, no matter how hard I pushed.

A．won’t

B．can’t

C．mustn’t

D．needn’t

3 . 从方框中选择恰当的单词或短语填入句子中，注意使用其正确形式。

complain        affect        symbol        abandon        potential       approve of         take up             regardless of               be at risk        on the contrary

1. —I suppose your parents don’t understand you.
—________， they understand me very well
2. Your attitude will ________how successful you are.
3. The chess club welcomes all new members________ age.
4. Chris wants to keep fit， so he ________jogging every morning.
5. Because I’m nearsighted， I’m worried that my daughter will ________ for it too.
6. Forming a V with your fingers is often recognized as the ________ for victory.
7. If you're unhappy with the room service， you should ________ to the manager.
8. Because of the heavy snow， we had to ________ the car and walk the rest of the way.
9. My parents need to know exactly where I plan to go before they can ________my trip.
10. Doctors are excited about the new drug's ________ benefits because it may save more lives.