用所给词的适当形式填空。

1. He always wears a pair of heavy ____ (glass).

2. My pen pal, Ann, is of medium ____ (high). And she is very beautiful.

3. Sun Yue, my favorite musician, ____ (have) long straight hair.

4. I want to be a ____ (sing) because I like music.

5. Do you often go ____ (shop) on Sundays?

电机安装完毕，交付使用前应进行负载试运行，但不必进行空载试运行。（）