I don’t know why he left ________without any words this morning.—Maybe he had something important to do.

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。

Many people think that it is ______ making such an experiment.

下列各句中，没有语病的一项是（ ）

I have a word with you It won’t take long.