----Shall I go and buy more food and drinks for the party ?----- No, we have prepared a fridge of those.That ____ be quite enough.

You can't imagine that a well－behaved gentleman ________ be so rude to a lady.

---- May I smoke here?---- If you      , choose a seat in the smoking section

—A shy boy like John ________ give up a secure job and start his own business!—Yes，nobody had expected that. 

Students ________ remain in their seats until all the papers have been collected.