He will come ____ three days.                           

A.before            B.after           C. in           D. later

―????????When do we need to pay the balance ?

―        September 30.

A. In                B. By               C. During             D. Within

  8. _____ the government agrees to give extra money , the theatre will have to close.

    A. Until                                                   B. Unless

    C. Since                                                   D. While

___ he came to study in the university, he has made much progress in the study of English.

A. While               B. When             C. Since             D. After

You are certainly right,____ others may say.                   A. what  B. whatever   C. that    D. as

Let’s walk over——the sun．

A．in B．to C．under D．by

He spoke loudly ____ the audience could hear him clearly.

A. so                        B. that             C. so that          D. in order to

____ to New York, her father has not heard from her.

A. Because she went B. After she went C. When she went  D. Since she went

The doctor will be free ____.

A. 10 minutes later                                      B. after ten minutes

C. in ten minutes                                    D. 10 minutes after

Did you have any trouble ____ the post office?

A. to have found      B. with finding       C. to find        D. in finding