根据以下材料，回答21-35题
In our online life, we need to use passwords frequently. We use passwords 21 e-mail,gaming sites, social networking sites, and other shopping sites. 22 , the passwords most people useare not very 23 and can easily be"broken" by others. In fact, the most commonly used passwords are so simple that it requires very 24 effort to figure them out. Can you guess 25 the most commonly used passwords are? They are: Names of baseball teams, birth dates of a family 26 , the year of a special sports event, the random numbers like 156468, 27 the name of a friend, pet,favorite TV star, or band.
There are programs 28 to break into people's online accounts. These programs are 29 of trying every word in the English dictionary and the dictionaries 30 many foreign languages, in their effort to break into an account. 31 can even search words backward. Some will try 32 words or words that are followed by numbers, 33 school222. These programs can test millions of passwords in a few minutes. So, you are advised to be careful about 34 passwords so that they
will be hard to break. You are also advised not to make them 35 hard to remember. Meanwhile,you need to change them once in a while.

第21题答案是

A

to

B

with

C

by

D

for

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答案：

D

解析：

空格所在句句意：我们将密码用于邮箱、游戏网站、社交网址以及其他的购物网站等。use for是固定搭配，意为“用于”，故选D。

第21题答案是

答案：

解析：

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