After a cold winter vacation, many people always stay at home, never exercise outside, so they usually _____ a few pounds.

_____ is believed to be the most excellent in allaspects will win a scholarship.

__________be settled. you make more effort

This computer doesn’t work, Sir.–Well, bring it back, ______ we’ll return your money.

下列各句中，划线的成语使用恰当的一句是（ ）