Friends play an important role in our lives, and although we may take friendship for【C1】__

____ , we often dont clearly know how to make friends.【C2】______ we get on well with a number of people, we are usually friends with only a very few—for example, the【C3】______ among students is about 6 per person. In all the cases of friendly relationships, two people like one another and enjoy being together, but【C4】______ that, the degree of intimacy between them and the reasons for their shared interest vary【C5】______ As we get to know people we take into account things【C6】______ age, race, economic condition, social position, and intelligence. Although these factors are not of primary importance, it is more difficult to get on with people when there is a marked【C7】______ in age and background. Some friendly relationships can be kept on argument and discussion,【C8】______ it is usual for close friends to have similar ideas and beliefs, to have attitudes and interests in【C9】______—they often talk about "being on the same wavelength". It generally takes times to reach this point. And the more【C10】______ involved people become, the more they rely on one another.

【C1】

A．given

B．provided

C．granted

D．presented