用括号内所给词的适当形式填空

1. Three_______(monkey) escaped from the zoo.

2. The_______(direct) of the local zoo told us the truth of the strange noise.

3. The students all felt________(happy) when they couldn't have the PE class.

4. Look at those people! They must                 _______(make)a movie now.

5. He is________(extreme) sad to hear his mother's death.

正弦交流电的三种基本表示方法是：解析法、（）和旋转矢量法。

A.公式法

B.展开法

C.波形法

D.图示法