1. 单词拼写(根据中文提示拼写单词)。

1. （1） My brother is  (十三) this year.

3. （2） I want to buy  (十一) watermelons.

5. （3） Look at his new  (裤子). They are very beautiful.

7. （4） There are four  (双) of socks in the bag.

9. （5） — Have you heard about the news?

   — Yes. The (价格) of petrol(汽油) went up last month!