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22题答案是

A However

B Therefore

C Moreover

D Besides