He made another wonderful discovery，____of great importance to science.

A. which I think is    B. which I think it is  C. which I think it  D.  I think which is

Alec asked the policeman ______he worked to contact him whenever there was an accident. 

A. with him  B. who       C. with whom      D.  whom

We will be shown around the city: schools，museums，and some other places，____other visitors seldom go. 

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

That is the town ____he was born.

A. which   B.  where   C.  when  D.   why..

Who__ has common sense can believe such a superstition.

A. who B.  which C.  but D.   that

In the dark street, there was not a single person _____she could turn for help.

A. that B.  who C.  from whom D.   to whom

The teacher ___ is at that desk over there.

A. you should talk to B. you are talked to　

C. whom you are talking　 D.　 whom you are talked to

She is one of the few girls who___ passed the examination.

A. was B.  were C.  has D.  have

This is a very boy _____parents were killed in the war.

 A. who B.  that C.  whose D whom

Give this prize to ___ composition is thought excellent.

A. whoever   B.  whosever   C.  whomever    D.  whatever