按要求变化句型。
1. I came here to return the money.(对划线部分提问)
_____ _____ you come here _____?
2. Oxfam Trailwalker is a tough charity walk.(对划线部分提问)
_____ _____ Oxfam Trailwalker?
3.The charity walk held every month.(对划线部分提问)
_____ _____ is the charity walk held?
4. I think it's impossible for him to finish it in ten minutes.(改为反意疑问句)
I think it's impossible for him to finish it in ten minutes, _____ _____?
5. It's fun to play with them.(改为感叹句)
_____ _____ it is to play with them.