______the end of last term, every student in the school, I think, has taken at least five maths tests.

A. By   B. Since   C. From   D. In

They dug _____,then put the box in it.

A. a three feet deep hole  B. a hole of three feet

C. a three feet deep hole  D. a hole of three feet deep

He has lived at____ for 30 years.

A. No. 101 heping Street       B. 101 Heping Street  

C. Heping Street 101          D. Heping Street No. 101

.As is known to all,____ tiger is in____ danger of dying out.

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

It snowed heavily for three days ____ and they were separated from the outside world.

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

It is generally considered unwise to give a child___________ he or she wants．

       A．however            B．whatever           C．whichever          D．whenever

When I tried to find _________that prevented so many people from taking part in the program, it seemed to me that there were two main reasons．

       A．why it did    B．that it did      C．what it was   D．why it was

He__________ he would be able to leave tomorrow, but it's beginning to took difficult．

       A．hopes          B．was hoping          C．had hoped           D．hoped

Tom failed ______ the experiment yesterday.

A. doing      B. did          C. to do       D. do

The problem is _____ we can master modern science and technology in a short time.

A. if     B. that         C. what        D. how