Must I stay here with you– No, you ______. You may go home, but you _____ goto the net bar(网吧).

The problem many children have out of school is getting more and more serious.

It is every citizen’s duty to go out to ______ the snow on the street______ it stops falling so as to make it convenient for traffic to pass. [ ]

Alice, please tell Eric to call me when he _____ back. –No problem.

I will never forget those days, ______ I spent in the countryside together with my grandmother as a child.