---What’s wrong with you? You look tired.
---I ______________ last night
A took out B stayed out C cleaned out D cut up
— There is still a copy of the book in the library. Will you go and borrow _____?
— No, I’d rather buy one in the bookstore.
A. one B. it C. another
_____ of the population in China ____ hardly to say.
A. A number , is
B. The number ,are
C. The number , is
—This physics problem is too difficult. Can you show me _____, Wang Li?
—Sure.
A. what to work it out
B. what to work out it
C. how to work it out
— How much did you pay for the new car?
— It_____ me more than ￥300,000.
A. cost B. spent C. Made
-- Mum, must I stay there the whole day?
-- No, you ______ . You ______ come back after lunch, if you like.
A. mustn't; can
B. needn't; must
C. needn't; may