- Dad, can I have _________ to eat? I’m hungry. - Sorry, there is _________ in the fridge. Can you go downstairs to buy some food?

In the ceremony, our headmaster required       students to improve our competitive awareness in modern society.

Cook was a strict but good captain, _________ who, usually, took care of the sailors on his  ship.

You may drop in or just give me a call. _________ will do.

．—Do you think_____     worthwhile to go all the way to Los Angles to buy that computer?—Well ,I’m going to visit some relatives, too.