How often one hears children wishing they were grown-ups and old people wishing they were young again. Each age has its pleasures and its pains， , and the happiest person is the one who enjoys what each agegives him without wasting his time in uselessregrets. Childhood is a time when there are few responsibilities. If a child has good parents, he is well fed, looked after and loved. It is unlikely that he will ever again in his life be given so much without having to do anything in return. In addition, life is always presenting new things to the child — things that have lost their interest for older people becausethey are too well known. But a child has his pains:He is not so free to do what he wishes to do; he is continually being told not to do things or being punished for what he has done wrong. Therefore, a child is not happy as he wishes to be. When the young man starts to earn his own living, he becomes free from discipline of school and parents; but at the same time he is forced to acceptresponsibilities. With no one to pay for his food his clothes, or his room, he has to work if he wants to live comfortably. If he spends most of his time playing about in the way that he used to as a child, he will go hungry. And if he breaks the laws of society as he used to break the laws of his parents, he may get himself into trouble. If, however, he works hard, goes by the law and hasgood health, he may feel satisfied in seeing himself make steady progress in his job and in building up for himself his own position in society. Old agehasalways been thought of asthe worst ageto be; but it is not necessaryfor the old to be unhappy. With old agecomeswisdom and the ability to help others with advice wisely given. The old can have the joy of seeing their children making progress in life; they can watch their grandchildren growing up around them; and, perhaps best of all, they can, if their life has been a useful one, fell the happiness of having come through the battle of life safely and of having reacheda time when they can lie back and rest, leaving everything to others. The happiest people should be those who______. A.Faceup to difficulties in life B.Hope to be young again C.Enjoy life in different age D.Wish to be grown up The word “they” underlined in Line 5, para. 2 refers to_____A.Older people B.New things C.Children D.Interests A child hashis pains because______.A.He can not do whatever he wants to B.He is not allowed to play in rain C.He hasa lot of new things to learn D.He can not play at the sea side freely When achild becomesa grown-up, he is supposedto_____.A.live comfortably B.Take responsibilities C.Make progressin job D.Impress the society The best title of the passagemight be_____.A.Pains and Ages B.Differences in Ages C.The Best Age to Be D.Happiness and Ages