(  )13. The elephant sat on his car because his car was so comfortable.

35. Then your once healthy cell bursts open, releasing new viruses to ____ more cells.

17. The house built of stone lasts longer than ____ built of wood.

60. 不能准时赴约是对他人不尊重的表现。

24. Doctor Jane ____ nice ideas for improving on her previous plans.

23. All computer systems contain hardware components for input, central processing unit and output, ____ how powerful they are.

57. 大都市是世界最著名的博物馆之一。你真应该仔细地看看而不是走马观花。

29. Bamboo is used ____ houses in some places.

27. Should it rain, the crops ____. 

26. He always thinks I’m wrong, ____ I may say. 

43. According to the author, why certain foods affect our moods has something to do with ____.

37. One of the most usual solutions to reduce mild depression is ____.