1. (2019七上·绍兴期末) 用方框中所给单词的适当形式填空。每词限用一次。

swim  twenty  price  eat   be

1. （1） There are thirty floors in this high building and I live on thefloor.
3. （2） Tom, in the river. It's too dangerous.
5. （3） In my room, my books and tapes on the desk.
7. （4） We sell all our clothes at very good .
9. （5） Cindy thinks that it's not a good habit to eat ice-cream after dinner.