快的副词用英语怎么表达？

　　他本不该把车开得那么快。

　　He oughtn't to have been driving so fast.

　　你怎么这么快就过来了？

　　How ever did you get here so quickly?

　　热带地区黑夜来得快。

　　Night descends quickly in the tropics.

　　我们的货物周转快。

　　We have a fast turnover of stock.

　　孩子比大人学得快。

　　Children learn faster than adults.