7.Let's go to the amusement cente.
Why don't we  go to the amusement cente. ?;
8.No one in the group plays better thab he.
he can plays the best  in the group
9.No hotel in the city is as comfortable as this.
This hotel is the most comfortable in the city. 
10.Other oceans in the worrld aren't as large as the Pacific one
The pracfic oecan is  the largest ocean in the world