--- ________ the class done most of the work?

   --- Yes, but the rest ___________ rather difficult.

       A. Has, are            B. Has, is                            C. Have, are          D. Have, is

Welcome to the Science Museum, everyone! This stone axe _______ in South Africa and

experts can’t be exactly sure about its use.

   A. had been found         B. was found       C. has been found D. would be found

Now the world’s attention ______ the stocking markets, as they have great influence in the world’s economy.

   A. is fixing on            B. has fixed on          C. is being fixed on         D. had been fixed on

Miss Li _ as a secretary for five years in the company, and now she is general manager of it.

  A. serves            B. served                 C. had served         D. has served

Last Monday，while the students      on the playground watching the national flag

      being raised，something unexpected           ．

      A．were standing；arose                        B．stood；was arising

      C．had stood；had arisen                         D．would stand；would arise

The concert__ to _ some money for those suffering from the earthquake, which __ 2,000 lives.

A. intending ; raise; killed                                 B. was intended; collect; claimed

C. to intend; raise; claimed                                D. intended; raise; killed

The company _______ a rise in salary for ages but nothing has happened yet.

A. has been promising   B. had promised            C. promised                  D. promises

—Where have you been all day?

    —I _______ some former classmates and I couldn’t get back until it was dark.

   A. have met           B. met               C. would meet     D. had met

I called Alice many times yesterday evening, but I couldn’t get through. Her brother _____ on the phone all the time!