----May we leave the classroom now?

----No, you         . You           to leave until the bell rings.

A．mustn’t; are allowed                   B．can’t; aren’t allowed

C．don’t have to; are allowed               D．needn’t; aren’t allowed

--- Can we leave the classroom now?

-- No, you ______. You ______ to leave until the bell rings.

A．mustn’t, are allowed                    B．don’t have to, are supposed

C．needn’t, aren’t allowed                D．can’t, aren’t supposed

--- May we leave the classroom now?

--- No, you ____________ . You ____________ to leave before the bell rings.

A. mustn't, are allowed         B. don't have to, are allowed

C. needn't, aren't allowed      D. can't, aren't allowed

---Can I ask you a question?

         --- No, you________. You _______to ask me questions during exams.

A. can’t, mustn’t                B. can’t, aren’t supposed                   

C. can, aren’t supposed           D.can, don’t have 

---May we leave the classroom now?

---No, you      . You       to leave until the bell rings.

A．mustn’t, are allowed                    B．don’t have to, are supposed

C．needn’t, aren’t allowed                D．can’t, aren’t supposed