[填空题]For most kinds of activities, a large group of people can accomplish more and have more fun than one person alone. For example, politicians, businessmen, workers, and 【B1】 criminals know that they must join organizations in order to be 【B2】 . Since there is usually strength in numbers, labor unions have a more 【B3】 influence on wages and company policy than individual workers 【B4】 . A person may also belong to social clubs and athletic teams 【B5】 he or she can meet other people who are interested in the same activities. 【B6】 you have a hobby, such as playing chess, collecting coins or stamps, or playing a musical instrument, you should join a club which has 【B7】 meetings to talk about your activity; the other 【B8】 will help you learn more about it. Of course, a group must be well 【B9】 . or it might be a failure. All the members should work together on projects and choose good leaders to 【B10】 their activities. In this way, the organization will benefit everyone in it.
A. A．what
B．at which
C．where
D．in which