1. 根据句意及首字母或汉语提示完成句子。

1. （1） It began d the Western Han Dynasty.
   

3. （2） We enjoy the sunshine on the b.

5. （3） I'm going on a summer (度假营) in Beijing.
   

7. （4） I'm going to have a (野餐) in the park.

9. （5） — Who e will go to the park with us?

   — My brother and my sister.