No student ________ go out of the school campus after 10：00 at night without permission according to the school regulations.
| A．shall | B．must |
| C．should | D．would |
The headmaster was______ as to how to inform her of the news that her daughter failed to pass the exam again.
| A．at ease | B．in relief | C．in a hurry | D．at a loss |
Your sister must be helping the little girl with her homework, _______ ?
| A．needn’t she | B．mustn’t she | C．isn’t she | D．must she |
Unbelievable as it is, the film 2012 without doubt________ a warning that human beings are faced with potential dangers
| A．belongs to | B．serves as | C．exists in | D．accounts for |
Is _______ Qinghai-Tibet Railway plays an important role in China’s railway history the topic that you’re coming to?
| A．it | B．that | C．what | D．this |
The police wondered________ of them is________ such a traffic accident.
| A．whom; blaming to | B．who; to be blamed on |
| C．who; to be blamed for | D．which; to blame for |