1 . 权衡利弊之后，大卫擦掉眼泪，挣扎着站起来，向起跑线走去，嘴角露出轻松的微笑。
After ________________, David wiped away the tears, struggled to his feet and made his way to the starting line, a relaxed smile appearing at the corners of his mouth.

2 . 海洋不仅给我们提供了充足的食物，而且它还保持了自然的平衡。
Not only does the ocean offer us sufficient food, but also it ________.

3 . 对露西来说保持工作和家庭生活的平衡是件难事, 所以她只好向她妈妈求助。(it作形式主语)
________________ her work and family life, so she has to turn to her mother for help.

5 . 如何平衡日益发展的心理需求，也是个颇让人头疼好的大问题。
It can be a big headache to ________ your ________ ________ needs too.

6 . Many methods have been tried to ________________________________.
为了保持自然的平衡，许多方法已经被尝试。

9 . 他还建议每个学员都要重视工作与生活的平衡。
He recommends every trainee attach importance to________ ________ ________ ________.