you used to smoke,---you?

you used to smoke,___you?
A.used to   B.don't    C.didn't     D.shouldn't
 
you ought ___for what you haven't done.
A.not to be punished     B.not be punished      C.to not punished    D.to not be punished
 
______you please tell me the way to the post office?
A.must   B.need    C.would    D.should
 
i'm sure he ____ have the computer sooner or later
A,shall     B.can     C.must      D.would
 
it's inportant that we _____ learn how to drive
A.have to     B.should      C.need      D.shall
这个题shal是不是有允诺的意思啊！