Read sentences and write words. （根据句意，填写所缺部分）

                          A

Which      How      What's      How long      How heavy

1. —             _ are you feeling?  

    — I'm feeling happy.

2. —                 is its tail?

    — 3 cm long.

3. —                one do you like? 

    — I like the big ong.

4. —                is the elephant?

    — Two tons.

5. —            _ happening there?

     — A car is coming.

                          B

Do    Why    If    Where    What

6. —               are you late?

    — I get up late.

7. —               you have a headache?

    — Yes, I do.

8. —             you are sick, see the doctor.

    — I know.

9. —              are you doing? 

    — I'm watching TV.

10. —              is the man?

      — He's in the room.

喷射混凝土是加固边坡的方法之一，它可以及时封闭边坡表层的岩石，从而提高岩石的强度，防止风化、潮解和（）。

A、剥落

B、坍塌

C、冒顶