7. —I called your office at about ten this morning, but there was no reply.—Oh, that was probably ________ I was paying a visit to a friend in hospital.

29. Under the regulation, restaurants and hotels shall stop offering throwaway items ________ customers request them.

下列属于非正式意义上的法的渊源的是（ ）。

根据认知失调理论，认知失调是改变人的态度的先决条件。

9. With more and more farmers moving to cities, an inadequate labor force is ________ becoming a major factor affecting the country’s grain output.

32.

豁达表现为教师气度宽宏大量，但学生违反纪律就绝不能宽容学生的错误。  

4. Perseverance (毅力) is a kind of quality and that’s ________ it takes to do anything well.

24. —Take a break, Amy. You ________ on the piano all morning.—All right. But the competition is coming soon. I have to work harder.

校园暴力是指在校学生之间存在的言语羞辱、敲诈勒索甚至殴打的暴力欺凌行为。这类行为主要侵害了学生的（ ）。

50. What do we know about E.T.?

16. —Could you do me a favor and take the box up to the six floor?—________.