根据上下文和提示完成句子。
1. What are you doing for vacation?
_______________________________________ (sightsee).
2. What are the twins doing for vacation?
______________________________________ (go hiking in the mountain).
3. ______________________________________?
He's fishing.
4. ______________________________________?
She's bike riding.
5.What are you and your family doing on Sunday?
_____________________________________ (have a picnic in the park).
