19. Scientists are trying to find out what advantage should be ________ the natural resources in this area.

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

18. The professor ________ sit in his study for hours when he worked on a new project.

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

33.

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

27. The book is of great help to ________ wants to do the job.

53. Why do scientists clone monkeys?

28. —You’ve left the light on.—Oh, so I have. ________ and turn it off.

25. It’s said that dogs will keep you ________ for as long as you want when you are feeling lonely.

30. —Mary, you water the plants in the garden and I will cook the dinner.—OK, ________.

下列选项中属于选聘班主任需要考查的条件的是（ ）。