We can never expect____ bluer sky unless we create_____less polluted world.
--- Shall we go for a drink at one o’clock this afternoon?--- ______. Will two o’clock be OK?
The language training programme ______ teenagers who want to go abroad to study.
--- Do you think George has passed the driving test? --- No, If so, he ______ his car to our college yesterday.
--- What has become of the spaceship? --- It landed ______.
--- You needn’t take an umbrella. It isn’t going to rain. --- Well, I don’t know. It ______do.