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

____ the sun, nothing would grow.

A. For                        B.With                    C. Under           D. Without

It happened ____ the Long March.          

A. during           B.in              C.at             D.for

The classroom is big enough         , but we’ll have to move if we have more students.

A．for the moment          B．on the moment C．in a moment      D．for a moment

“Shall we stop for lunch _____ shall we drive on？” “Let’s stop for lunch, but the driver can’t drink _____ drive.”

    A. and, and                                               B. or, or

    C. and, or                                                 D. or, and

I am sure ____ you said is true.                

A. what       B. that      C. which     D. who

She thought I was talking about her daughter， ，in fact，I was talking about my daughter．

A．whom B．where C．which D．while

“How long have you been here?” “_______ the end of last month.”

A. In B. By  C. At    D. Since

____ the problem of method is solved, talking about the task is useless.

A. Until                          B. Since                         C. After                    D. Unless