—These days， teenagers often have to do what they ______ to.
— It’s not good for their independence. They need to think on their own.
A. tell
B. are telling
C. are told
D. were told
The number of the cars ________ greatly since 2008 in the small town.
A. had increased
B. has increased
C. was increasing
D. increased
The scientists will succeed in their experiment______ they give up.
A. unless B. if C. after D. until
Michael’s mother never makes him______his room. He does it by himself.
A. cleaningB. cleans C. to clean D. clean
Jill_______be in the office now. She has gone to the reading room.
A. can’t B. mustn’tC. needn’tD. shouldn’t
My family are going to have a party to celebrate my grandpa’s ______birthday.
A. ninety B. ninetiesC. ninetiethD. ninetieths
