几道英语选择题，急！！

Question

He ____,but he don't now.
A.is used to smoke B.is used to smoking C.used to somke D.uses to smoke

I advised he ___for a holiday.
A.went B. go C.going D.to go

What shoule we do if it ____ tomorrow?
Ashould snow B.would snow C.snow D.will snow

We must be____the worst.
A.preparing B.preparing for C.prepared D.prepared for

主要给我讲解为什么，答案我都知道不需要给我答案

Answer 1

He ____,but he don't now.
A.is used to smoke B.is used to smoking C.used to somke D.uses to smoke

选C，used to do sth.表示过去常常做某事，但现在不做了，be used to doing表示习惯做某事，根据语意选C

I advised he ___for a holiday.
A.went B. go C.going D.to go

选D，advise sb. to do sth.表示建议某人做某事，还有一个建议是advise doing sth.中间不加sb.就是指建议做某事

What shoule we do if it ____ tomorrow?
Ashould snow B.would snow C.snow D.will snow

选C，if引导条件状语从句，从句使用一般现在时表示假设

We must be____the worst.
A.preparing B.preparing for C.prepared D.prepared for

选D，该句的意思是我们必须为最坏的情况作好准备，用be prepared for表示准备，不能用B，B表示正在进行的动作根据语意不符合，prepare是不及物的所以要用介词for

Answer 2

c.used to do 过去常常作某事

D.advise sb to do