Are these books ________? —No, they are not mine. They belong to _____.

Look! There is a big river. Let’s swim in it!—No, I think it’s _________ dangerous.

The famous author often tells stories to the sick child tohim .

I don’t think I will win a lottery (彩票) of —Well, ______. Everything can happen.

Hiking is_______ camping. I like both of them.[ ]