The teacher told us that it was a good habit ___ in every class .

Listen! Is Kate playing the piano in the room—No. It _________ be her. She has gone to London with her parents.

Don’t answer me with a simple “yes” or “no” Explain______possible

You didn’t use to like him much when we were at school, ___________?

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。