31 I came here _____ to ask for your instruction, not for other purpose

When I met him the other day，it was the first time we ____ each other since we graduated from school

填入下面文段空白处的词语，最恰当的一组是=（ ）生活中 ① 有掌声和欢笑，还有困难和挫折。 ② 不培养坚强的性格和不怕困难的精神， ③ ， ④ 懂得很多好道理， ⑤ 未必真有用处， ⑥ 正像温室里的花卉似的，是经不起日晒雨淋的。  ①②③④⑤⑥

Many people do not realize the importance of health __________ they have fallen ill.

下列各项中加点词的解释完全正确的一项是