用适当的介词填空。

1. There are two windows ________ the wall.

2. The broom is ________ the door. I can’t see it.

3. There is a dog ______ the tree. It can’t get down.

4. Where is the photo ________ your family?

5. There are some big apples _______ the tree.

对（）等威胁矿井生产的各种水害进行检测、诊断，发现异常及时预警预控。

A.断层水

B.煤层顶底板水

C.陷落柱水

D.地表水