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

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

31. You will have to ____ some outside help or you will never get the job finished in time.

44. If your brain does not make enough of a certain kind of neurotransmitter, you will ____.

(  )15. The customs officer believed his story finally after the letter was shown by the man. 

46. Will looking at good pictures help you learn how to decorate rooms better? Why or why not?________, because you don‘t know what to look for and why it is ________. 

(  )14. Unfortunately, the owner of the elephant refused to pay for the loss of the man.

49. When can you begin to look at the successful room in a new way?Once you ________ the three guidelines.

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

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

(  )54. In order to help readers spend their money more reasonably on Black Friday, the author would like to share a few Black Friday tips.

19. Not only ____ about the food, she also refused to pay for it.