Mary dropped in ____ Mr Smith, but he  wasn' t at home, so she went to drop in ____ Mr Smith's office.          

A. on, on         B. at, at          C. on. at          D. at. on

  11. —Would you like to come to dinner tonight？

    —I’d like to, ___ I’m too busy.

    A. and . B. so

    C. as. D. but

I'd like to go swimming ____ the water is not too cold.

A. for               B. unless             C. if                D. whether

____ you work, you must always serve the people heart and soul.

A. Wherever                  B. Whenever            C. Where                D. When

I wanted two seats Madame Curie for Friday night，so I rang the cinema to see if I could book two tickets．

A．of B．a(chǎn)bout C．to D．for

It rained heavily,____ the basketball match had to be put off.

A. so that                   B. when                  C. otherwise        D. therefore

____ he was in poor health, he worked just as hard as everyone else.

A. But             B. Although              C. Even if        D. If

The number of the employees has grown from 1,000 to 1,200. This means it has risen ____20 percent.              

A. by                        B. at                C. to                      D. with   

____ the students likes the paintings. Which is wrong?

A. The teacher as well as  B. Nobody but C. The teacher besides D. All except

We left Xi' an _.___ a very hot summer afternoon.

A. on                    B.in                C. during        D.by