句型转换，不改变原意。
1. This hotel is the best of all in the city. (不改变原意)
This hotel is better __ hotel in the city.
2. Playing the piano is not easy to learn. (不改变原意)
__ is not easy _ playing the piano.
3. Zhou Qiang doesn't run as fast as I do. (不改变原意)
Zhou Qiang runs _ __ _I do.
4. The boy doesn't do as well as the girl. (不改变原意)
The boy does _ _ _the girl.
5. All the runners start to run as soon as they hear the gun. (不改变原意)
All the runners start to run_____ _____ _____.
