用所给单词的适当形式填空

1. Tom and I____  (be) brothers.

2. Those____(be)  my grandparents.

3. What____(be) these?

4. ____ ( this)  are my friends Li Lei and Lin Tao.

5. Those are my____(key).

6. Are these your____(book)?

7. That's____(he) brother.

8.        (be) you Mary?

水位表见不到水位时（）

A、定为缺水事故

B、定为满水事故

C、应用叫水的方法判断是缺水还是满水