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