both wrong.
Both of them should be blamed.

尽快。
As soon as possible. *缩写是ASAP。


Should I mail this letter to you? (我可以把这封信寄给你吗?)
Yes. As soon as possible. (对，请尽快寄来。) *电话中的对话。

随便吃。
All-you-can-eat.
buffet
smorgasbord
Eat as much as you like.
Eat as much as you wish. *作为句子应为“你想吃多少就吃多少”。

多项选择。
multiple-choice
multiple-choice questions (多项选择题)

各就各位，预备，跑!
Ready, get