1. 根据句意, 用方框中所给词或短语的适当形式填空, 每个词或短语仅能用一次。

humor, brave, sky, cool, can't help laughing

1. （1） It's hard to see a blue and clear because of the air pollution.
3. （2） The story was so funny that we all .
5. （3） Mr Li is . He always makes his classes lively and interesting.
7. （4） You are no longer a kid. You should learn to be enough to face difficulties.
9. （5） How the girl looks in a pink dress and a hat!