—You needn't take an umbrella.It isn't going to rain.—Well, I don't know.It________do.
Miss Chen can show you around _______ mountain, because she has ______ good knowledge of it.
The athletes competed ________ each other for gold medals in the Olympic Games.
All his free time is ______ by volunteer work, but he feels it meaningful.
Bill Gates is so _____ that he has given away most of his money to the poor.
They are now holding talks in a friendly _________ in the meeting room.