8．a great deal of time and effort

7．There’s no doubt that

6．It cost me

5．How much do you charge for

4．her efforts at last paid off

3．could have worked out this problem

2．may(might) have passed the driving test

1．must have lost it

10．He ____________(同玛丽结婚有三年了)．(marry)

[答案]

9．The government ____________(已号召毕业生到西部工作)．(call)