用所给词的形写填空。    

1. A               ( medicine) team was sent there yesterday.    

2. No students are allowed in the classroom without                (permit).    

3. If Larry were                ( come) , what would we say to her?    

4. I wish I               ( be) 20 years younger.    

5. If you lived there for a while, you                ( change)you mind about that place.

（）是教师通过操作实物媒体来帮助学生认识事物、获得化学知识、学习实验技能的一种常用的化学教学基本方法。

A.演示和展示

B.展示和合作

C.演示和提问

D.展示和板书