69. The (pollute) sky is covered with dark clouds every day,so the air pollution is quite serious.

68.(compare) with the older model? the new robot costs less but lasts longer.

67.(dry) food can be stored for several months.

66. The news ran (rapid) in all the newspapers.

65.(十二分之七) of the students have been to Beijing.

64. The fact that I am a foreigner is a big (不利因素) .

63. We could probably trust her with the information but it’s just not worth the (風(fēng)險(xiǎn)) .

62. We must accept the (可能性) that we might be wrong.

61. We all need (氧氣) to breathe.

There are many things you can do to improve your memory. Among them are many kinds of useful ways as well as taking special care of your health.

It is important that you make yourself excited to make your memory more active. You can do this by doing some new activities and by changing your daily habits. Learning a new skill helps your brain to develop. When trying to remember something,you should pay special attention to the most important things about it. Do not allow other thoughts to enter your mind because they will reduce your chances of making right memories.

An excellent way to help memory is to connect information with pictures. Try to see the pictures in your mind. Taking notes and keeping a diary will also be helpful.

Healthy food and plenty of vitamins are necessary for your memory to work well. Drinking a lot of water also helps keep your memory. You must allow your brain to have enough sleep and rest. When you are sleeping,your brain stores memory. Not enough sleep can cause problems with storing information. And being tired will also stop you from being able to think clearly and well.

In order to keep your mind on your work,you must be free from worry. Generally keeping fit and normal health checks are both important—not just for improving your memory.

根據(jù)短文內(nèi)容，完成下面的表格。

51. 52. 53. 54. 55.

56. 57. 58. 59. 60.