材料
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 use are 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.
（34）题选项是（）
A. locating
B. searching
C. choosing
D. tracking
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