While dancing happily at home, ______.

A.the door bell rang

B.the door bell rings

C.we heard the door bell rings

D.we heard the door bell ring

More and more people are learning to surf the Internet, ______advantage of the convenience and efficiency benefits

A.taking                              B.taken

C.having taken                     D.having been taken

All her friends called up _____ her on her winning the first prize in the Global Lady Competition.

A. celebrate    B. memorize    C. congratulate    D. welcome

I’ll never forget the moment _____I first met Mary and _____ makes me already feel happy.

  A. that; that   B. which; what    C. at which; which    D. when; what

-----Tom. You look very bored and tired.

 -----Yes, I ______ my father on the farm until seven o’clock this morning.

   A. have been helping    B. had helped      C.was helping     D. am helping

— Can you please lend me another $300? I need it urgently?

—_______. You mean you already burned through the $500 I gave you yesterday.

A. No way          B. No trouble

C. Never mind       D. No possible

In order to make students have a good knowledge of science subjects, they are encouraged to______ their own science experiments.

  A. operate    B. direct    C. manage    D. conduct

Nowadays children should learn to ______ other children.

A.be related to                                                                B.relate to

C.do with                                                                           D.refer to

You'll have to be patient ______ my mother ----she's going rather deaf, which ,after all，also makes her badly cut ______.

  A. at; up    B. with; up    C. for ; down     D. on; off

My boss left word with my assistance______he would hold a meeting at six in the evening for personnel matters.  

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