【推荐1】_________________, the environmental problems will become worse. 
如果我们不采取任何行动，环境问题将会变得更糟。

【推荐3】To inspire young people ________ ________ ________ (采取行动) for the environment, animials and their community, Roots & Shoots was established. (根据汉语提示完成句子)

【推荐1】一听到这一消息，成群的新生兴奋地离开了他们的父母。（upon/on doing；“with+抽象情感名词”作状语）
________________, groups of freshmen left their parents ________________.

【推荐3】经过三个小时，他成功地登上了山顶。(一句多译)
①After three hours, he ________________________________________________________ to the top of the mountain.(manage to do)
②After three hours, he ______________ ______________ ______________ ______________ to the top of the mountain.(succeed in doing)