--- He may be in the classroom ,I think.
--- No, he ___________ be in the classroom ,I saw him go home just now.
A.needn’t B.mustn’t C.can’t D.shouldn’t
—I’m tired out these days.
--Well, you’d better keep a _____ between work and play.
A.promise B.diary C.balance D.secret
Ladies and gentlemen, please remain in your seats.The plane________.
A. takes off B. is taking off C. has taken off D. took off
A ship is safe if it stays in a harbour. But this is not ___________ it is built.
A.what B.how C.why D.where
—Some say drinking coffee can cause cancer.
—Well, coffee drinking hasn’t been shown to ___________ your risk of cancer.
A. invite B. introduce C. imagine D. increase
According to Forbes, Amazon’s CEO, Jeff Bezos is now the _______ person in the world.
A.wealthiest B.wealthier C.wealthy D.most wealth
