— 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 allowed

C．needn’t, aren’t allowed

D．can’t, aren’t allowed

预计的现金支出主要包括（）。

A.采购原材料

B.支付工资

C.支付管理费

D.营业费