New Words：

possible [ˈpɒsəbl] adj.可能的, 尽可能的, 合理的
impossible [ɪmˈpɒsəbl] adj. 不可能的, 做不到的

Sample Sentences：

I'll do everything possible to help you.
It is now possible to put a man on the moon.
You must make the houses as strong as possible.
It is possible for you to get there in 20 minutes' walk.

It's impossible to tell who will win the game.
It's impossible for us to finish the work in one day.

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