你知道填哪一个更准确吗?  

1. It's _       (on, in) the first floor.

2. Do you have lunch          (at, in) school?

3. It's time           (to, for) watch TV.

4. It's time           (to, for) breakfast.

5. These are         _ (he, his) pants.

6. Let            (I, me) close the door.

7. It's             (snow,  snowy) here.

8. What's the matter            (with, for) you?

9. How many            (sheep, sheeps) do you have?

10. It's cool           (in, at) Lhasa.

下选项哪种是民用建筑常用的结构类型？（）

A.砌体结构

B.框架结构

C.空间结构

D.A、B、C都是