初中英语被动语态单选题

-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

You______be tired after playing sports for a long time without a rest.
A.must                   B.need                 C.can’t

--- _____ I use your ruler, Lingling? 
--- Sure. Here you are.

A．May

B．Would

C．Need

D．Must