Language is a tool of communication. The symbol "Highway Closed" on a highway serves（）。

单项选择题The word Motel comes from motor + hotel . This is an example of （） in morphology.

A. backformation
B. conversion
C. blending
D. acronym

单项选择题Owen wouldn't eat anything （） he cooked it himself.

A. until
B. since
C. unless
D. while

单项选择题— Sorry, I have to （） now. It's time for class. — OK, I'll call back later.

A. hang up
B. break up
C. give up
D. hold up

单项选择题It was a nice house, but （） too small for a family of live.

A. rarely
B. fairly
C. rather
D. pretty

单项选择题I can't leave. She told me that I （） stay here until she comes back.

A. can
B. must
C. will
D. may