Question

1. It's the cheerfulness and lack of hesitation        that their parents mean by what they say. (impress)

是兴奋和亳不犹豫的语气让孩子们意识到父母是说真的，不是开玩笑的。

Answer 1

1. that impress upon the children考查强调句和主谓一致。impress sth. on / upon sb., impress on / upon sb. that使某人印象深刻的是u本句强调主语the cheerfulness and lack of hesitation,因匕谓语用复数。强调句型的构成是：It is (was)+被强调部分+that(who)+句子的其他成分。被强调部分可以是主语，宾语，表语或状语。强调的主语如果是人，可以由who代替that:,强调句的时态和句子的谓语动词时态要一致.