Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer for each of the blanks.

The ability to weep is a uniquely human form of emotional response. Some scientists have suggested that human tears are (16)_________of an aquatic past, but this does not seem very likely. We cry from the moment we enter this world, for a number of reasons. Helpless babies cry to persuade their parents that they are ill, hungry or uncomfortable. As they (17)_________, they will also cry just to attract parental attention and will often stop when they get it.The idea that having a good cry do you (18)_________is a very old one and now it has scientific validity since recent research into tears has shown that they (19)  a natural painkiller called enkaphalin. By fighting sorrow and pain, this chemical helps you feel better. Weeping can increase the quantities of enkaphalin you (20)_________.Unfortunately, in our society, we impose restrictions upon this naturally (21)_________activity. Because some people still regard it as a (22)  of weakness in men, boys in particular are admonished when they cry. This kind of repression can only increase stress, both emotionally and physically.Tears of emotion also help the body (23)_________itself of toxic chemical waste, for there is more protein in them than in tears resulting from cold winds or other irritants. Crying comforts and calms can be very enjoyable - (24)_________the popularity of highly emotional films which are commonly (25)_________“weepies”. It seems that people enjoy crying together almost as much as laughing together.Question 17