There are always many volunteers in greatevents, ________–Yes. Many hands make light work.

According to a recent survey, Google Play is one of ________ apps in the world.

Is that Mr．Smith over there? —– No, it _____ be him — I am sure he is much taller.

Could I have a word with you，mum?—Oh，dear，if you _____．

1don’t search my book case for your CD-player! Just look where it __ be in the drawer, in your schoolbag, or somewhere else like that.