You will achieve nothing ______ you work hard in a proper way.
A. because B. if C. when D. unless
Paper cutting looks very easy ______ it may be difficult to do.
A. or B. so C. but D. for
The girls ______ how to dance a month ago and now they can dance well.
A. were taught B. will be taught
C. are taught D. have been taught
Tom ______ an experiment when someone knocked at the door.
A. does B. did C. is doing D. was doing
Mike ______ more than 600 people here in the past two years.
A. is interviewing B. has interviewed
C. interview D. will interview
The man is feeling much better now, so you ______ call a doctor.
A. can’t B. mustn’t C. needn’t D. shouldn’t
