填入下面一段文字横线处的语句，最恰当的一句是(　　)他人的微笑，真伪难辨，但________微笑战斗，强似哀兵必胜，那微笑是给予对手的饱含怜悯的批判。

Greatly ________, the students made up their minds to carry ________ the experiment.[ ]

ot doing the things we like, but liking the things we have to do ________ makes life happy.

Do you often _____ football games ____ your friend

I pay the bill by check－ Sorry, sir. But it is the rules of our hotel that payment _______ be made in cash.