How fast can you type?

　　你打字有多快？

　　Children grow up so fast these days.

　　如今孩子們長得真快。

　　There are no hard and fast rules about this.

　　這事沒有什么硬性的規定。

　　Research indicates that eating habits are changing fast.

　　研究顯示，飲食習慣正迅速改變。

　　Things are not moving as fast as we hoped.

　　事情的進展不像我們希望的那么快。