64. If you lack a good knowledge of science , you may be scared of some natural ____________(现象).

63. Scientists think they are beginning to make a great________________(突破) in the fight against AIDS.

62. Many westerners have a strong b________________ in God.

61. With the vegetable supply d__________ in the heavy snow, the prices of vegetables were expected to keep rising.

60. You should not look down upon people who do physical l___________________.

59. According to scientific research, a dog can be a good c_____________ of man in his old age.

58. With her husband dead, she had to work day and night to s____________ the big family.

57. You should g__________ the opportunity. If you let it go, it won’t come again.

56. The big cellphone company has a___________ great success in developing a new type.