1 . There was a time _____ each teacher spent an hour testing students in every subject. (用适当的词填空)

2 . It was on a cold winter night ____ Tom was waiting for his girlfriend to see a movie with him ________ the accident occurred.

A．that; that

B．when; that

C．when; who

D．which; where

3 . —I can never forget the days       we spent together in the summer camp.
—Well, especially the day       it suddenly began to rain in the middle of the night.

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

4 . The first week of university is an exciting time _______ freshmen familiarize themselves with their college and make new friends.

A．that

B．when

C．what

D．on which