John________ us when he is free.
A.joins B.join C.will join D.joined
It's rather cold here. You'd better ________ your coat.
A.put away B.not put on C.not take off D.take off
—I'm afraid we can't work out the math problem________the teacher helps us.
—That's true. It's too difficult.
A.if B.unless C.because D.as soon as
—May I use your computer?
—________. I'm working on it.
A.Glad to hear that B.It doesn't matter C.That's all right D.I'm sorry
Amy has read many history books, so she learns history________ of all the subjects.
A.well B.bad C.best D.worst
—Look! The children ________.
—How happy they are!
A.was dancing B.danced C.are dancing D.dances
