He wrote the article ____ three days.  

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

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

— Must I turn off the gas after cooking ?

   — Of course . You can never be____careful with that .

         A．enough     B．too    C．so      D．very

John Smith , a successful businessman , has a_____ car . 

         A．large German white           B．large white German

         C．white large German           D．German large white

All the people ______ at the party were his supporters.

A. present                     B. thankful                 C. interested        D. important

English is better than ________.

A. any language                       B. any languages

 C. any other language                D. all languages

John Smith, a successful businessman, has a ______car.

A. large German white              B. large white German

C. white large German              D. German large white

John, look at the time. ______ you play the piano at such a late hour ?

A. Must      B. Can        C. May       D. Need

 “Show me your permit, please.” “Oh, it’s not in my pocket. It ______.”

    A. might fall out            B. could fall out

    C. should have fallen out    D. must have fallen out

—The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the

job?

—____ my students have a try?

A. Shall            B. Will           C. Could          D. Should