传统的调查方法包括（）。
A、网络调查
B、文献调查
C、统计调查
D、会议调查
E、走访调查
参考答案：B, D, E
— 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
The owner of the mine was ________ to twenty years in prison because he had broken the law to employ children as miners.[ ]
A．sentenced
B．trapped
C．sheltered
D．buried
