In our online life, we need to use passwords frequently.We use passwords 【C1】______ e-mail, gaming sites, social networking site

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问题      In our online life, we need to use passwords frequently.We use passwords 【C1】______ e-mail, gaming sites, social networking sites, and other shopping sites.【C2】______,the passwords most people use are not very 【C3】______ and can easily be “broken” by others.In fact, the most commonly used passwords are so simple that it requires very【C4】______effort to figure them out.Can you guess 【C5】______the most commonly used passwords are? They are: Names of baseball teams, birth dates of a family【C6】______, the year of a special sports event, the random numbers like 156468, 【C7】______the name of a friend, pet, favorite TV star, or band.
     There are programs【C8】______to break into people’s online accounts.These programs are【C9】______of trying every word in the English dictionary and the dictionaries【C10】______many foreign languages, in their effort to break into an account.【C11】______ can even search words backward.Some will try 【C12】______words or words that are followed by numbers, 【C13】______school222.These programs can test millions of passwords in a few minutes.So, you are advised to be careful about 【C14】______passwords so that they will be hard to break.You are also advised not to make them 【C15】______hard to remember.Meanwhile, you need to change them once in a while.
【C1】

选项 A、to
B、with
C、by
D、for

答案D

解析 空格处的句子所要表达的意思是“将密码用于邮箱、游戏网站等”,use…for意为“用于”,故选D。
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