PART IV CLOZE [10 MIN] Decide which of the words given in the box below would best complete the passage if inserted in the corresponding blank. The words can be used ONCE ONLY. Mark the letter for each word on ANSWER SHEET TWO. A. accompanies B. automatically C. couple D. goes E. indebtedness F. kind G. manner H. mercifully I. one J. obey K. renowned L. subscribe M. unknown N. virtue O. widespread A few years ago, a university professor tried a little experiment. He sent Christmas cards to a sample of perfect strangers. Although he expected some reaction, the response he received was amazing – holiday cards addressed to him came pouring back from the people who had never met nor heard of him. The great majority of those who returned a card never inquired into the identity of the ______ (31) professor. They received his holiday greeting card, and they ______ (32) sent one in return. This study shows the action of one of the most powerful of weapons of influence around us – the rule of reciprocation. The rule says that we should try to repay, in ______ (33), what another person has provided us. If a woman does us a favor, we should do her ______ (34) in return; if a man sends us a birthday present, we should remember his birthday with a gift of our own; if a ______ (35) invites us to a party, we should be sure to invite them to one of ours. By ______ (36) of the reciprocity rule, then, we are obliged to the future repayment of favors, gifts, invitations, and the like. So typical is it for ______ (37) to company the receipt of such things that a term like “much obliged” has become a synonym for “thank you,” not only in the English language but in others as well. The impressive aspect of the rule of reciprocation and the sense of obligation that ______ (38) with it is its pervasiveness in human culture. It is so ______ (39) that after intensive study, sociologists can report that there is no human society that does not ______ (40) to the rule.