44. What advice does Herbst most likely give to teens by her camp experience?

（ ）也叫“助长性迁移”，是指一种学习对另一种学习的促进作用。

教师职业良心具体要求有（ ）。

52. What is special about China’s cloning monkey?

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.

23. You may think of giving up study, in ________ case just think it over before making the   decision.

6. —You looked anxious just now.—I ________ John at ten, but he didn‘t turn up.

48. Why are test screenings necessary?

21. She asked the young man to be brief and ________ as she had little time to spare.

下列属于非正式意义上的法的渊源的是（ ）。

20. The shop owner will get all these goods ordered ________ to the customers today.

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