She got a message from Miss Zhang _____ Professor Wang couldn’t see her the following day.

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

With the introduction of the computer , libraries today are quite different from _____ they were in the past.

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

Overall, our study offers proof that students who worked more than 20 hours weekly were not comparable to their classmates.

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

1，_____ (开夜车)makes working teenagers more tired in school.2，_____ （工作很多个小时）can be associated with increased alcohol and drug use.3， It is no good_____.（每周工作10多个小时）4，_____（为我的老板安排日程agenda） is the most difficult work in the world.5，_____（看电影） is my favorite passtime.