--- Shall I lock the lab now before I go home?

--- 　　　　. I’ll check it myself later.

A．Go ahead　　　 B．No problem　 C．No hurry　　 D．Don’t bother

Keys should never be hidden around the house since thieves _____ know where to look.

A. virtually 　　B. variously 　　C. unavoidably 　　D. invariably

We might have failed if you ___ us a helping hand.

A. have not given B. would not give C. had not given D. did not give

— How do you learn English so well?

　 — ______ it every day.

　　 A. In speaking　　 　　 B. By speaking　

　　 C. With speaking　 　　 D. On speaking

____________    we first heard of the man referred to as a computer specialist in software.
A．It was Hilary that          B．That it was from Hilary
C．It was from Hilary whom  D．It was from Hilary that

Some of the exercises appear to be _____ ones that you have done, but after taking _____ second look, you will find that they are different.

　 A. /; the　　　　 B. the; the　　　　　　 C. the; a　　　　 D. the, /

What_______ public is concerned about is whether medical workers and scientists will be able to find ______cure for the new disease in a short time.

A. /;/　　　　　 B. /;the　　　　　 C. the; a　　　　 D. the;/

Now Tom together with his classmates _____ football on the playground.

    A. play              B. are playing        　　 C. plays           　　 D. is playing

We ______ you more help then, but we were so busy at that time.
   A. ought to have given       B. must have given   
  C. might have given          D. need have given

After graduation she reached a point in her career　　　　 she needed to decide what to do.?

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