1 . It is a waste of time _________ (try) to explain the problem to him. (所给词的适当形式填空)

2 . 在每个出版商都拒绝我之前，我不会放弃。(not...until) （汉译英）
________________________________________________________________________.

3 . 每天读书是值得的。(worthwhile) （汉译英）
________________________________________________________________________.

5 . 嘲笑别人的外貌是残忍的。（汉译英）
___________________________________________________________________________________

7 . 与整个地球的大小相比，最高的山似乎一点儿也不高。
_________ the size of the whole Earth, the highest mountain does not seem high at all.

8 . 我正要付现金，突然想起我把钱包忘在家里了。
I was going to pay by cash when _________ I had left my purse at home.

9 . 迈克有可能提前完成这项任务。
__________the task ahead of time.

10 . 你错过了上周的运动会太可惜了。
_________you missed the sports meeting last week.