The students respect their head teacher，although she is strict，she is fair

下列各句中，没有语病的一项是（ ）

ing , who used to be captain ofChinese Women’s volleyballteam, ______volleyball in China for almosttwenty years.

It is required in our school that lights in students’ rooms ______ off by 11o’clock.

The pressure of this gas pipe is greater than__________.