句型转换。

1. Bruce has art lessons twice a week.(对画线部分提问)

    ______ ____  ______ ____ does Bruce have art lessons?

2.She hardly knew how to solve this math problem.(完成反意疑问句)

   She hardly knew how to solve this math problem, ______ ____  ______ ____?

3.It is interesting to send English messages to friends on a mobile phone.(改为感叹句)

   ______ ____ ______ ____ interesting thing it is to send English messages to friends on a mobile phone!

物料平衡取决于温度、热量和（）的平稳

A、压力

B、液位

C、风量