1. 选词填空。

those,   learn,   light,   catch,   difficult

1. （1） The basketball is heavy, but the ping­pong ball is .
3. （2） Can you teach me to play football? I want to .
5. （3） Math is easy, but Chinese is very .
7. （4） Li Ming can throw the basketball, but Danny can't it.
9. （5） I don't want these shoes. I want to buy shoes.