_____ we ever meet again I hope he remembers to thank me.
A. If and when B. When and where
C. If and what D. When and how
Having checked the doors were closed, and all the lights were off, the boy opened the door to his bedroom.
A. why B. that
C. when D. where
It is _____ he often breaks the schools rules _____ makes his teacher unsatisfied with him.
A. what; that B. that; what
C. that; that D. which; that
When I try to find _____ that prevents so many people taking part in the program, it seems to me that there are two main causes.
A. what it does B. what it is
C. why it does D. why it is
---Did you have any trouble catching the professor’s lecture?
---No. He spoke very slowly and clearly to make it easy _____.
A. to understand B. understand
C. understanding D. understood
Although there are many _____ programs on TV, I think people should not be spending so much of their time in front of their TV sets.
A. worthwhile B. interesting
C. good D. worth
