1 . Parents feel that it is difficult to live with teenagers. Then again, teenagers have_______feelings about their parents, saying that it is not easy living with them. According to a recent research, the most common _______between parents and teenagers is that regarding untidiness and daily routine tasks. On the one hand, parents go mad over _______rooms, clothes thrown on the floor and their children’s refusal to help with the _______. On the other hand, teenagers lose their patience continually when parents blame them for _______the towel in the bathroom, not cleaning up their room or refusing to do the shopping at the supermarket.

The research, conducted by St. George University, shows that different parents have different _______to these problems. However, some approaches are more _______than others. For example, those parents who yell at their children for their untidiness, but _______clean the room for them, have fewer chances of changing their children’s _______. On the contrary, those who let teenagers experience the ________of their actions can do better. For example, when teenagers who don’t help their parents with the shopping don’t find their favorite drink in the refrigerator, they are forced to ________their actions.

Psychologists say that ________is the most important thing in parent-child relationships. Parents should ________to their children but at the same time they should lend an ear to what they have to say. Parents may ________their children when they are untidy but they should also understand that their room is their own private space. Communication is a two-way process. It is only by listening to and ________each other that problems between parents and children can be settled.

2 . How long can human beings live? Most scientists who study old age think that the human body is ___ to live no longer than 120 years. However, 110 years is probably the longest that anyone could hope to live — if he or she is ___ healthy and lucky. Some scientists even say we can live as long as 130 years! Yet, our cells simply cannot continue to reproduce ___. They wear out, and as a result, we get old and ___ die.

Even though we can’t live forever, we are living a ___ life than ever before. In 1900, the average American life span(寿命)was only 47 years, but today it is 75 years!

When does old age begin then? Sixty-five may be out-of-date as the ___ line between middle age and old age. After all, many older people don’t begin to experience physical and mental ___ until after age 75.

People are living longer because more people ___ childhood. Before modern medicine changed the laws of nature, many children died of common childhood ___. Now that the chances of dying ____ are much lower, the chances of living long are much higher due to better diets and health care.

On the whole, our population is getting older. The ____ in our population will have lasting effects on our social development and our way of life. Some people fear such changes will be for the worse, while some see ____, not disaster. Today, many men and women in their "golden years" are healthy, still active, and young in ____ if not in age.

As our society grows old, we need the ____ of our older citizens. With long lives ahead of them, they need to ____ active and be devoted.

3 . We all know that some things are obviously right. For example, it is right to be _______ to other people. It is also right to look after the environment. Some things are_______ wrong, too. For instance, we should not hurt or bully (欺负) others, nor should we litter. Rules often tell us what is right or wrong.

Rules can help the public make the right _______, and remain safe. Car drivers have to obey traffic regulations that tell them the right things to do on the road to avoid crashes. Cyclists who give signals before turning or stopping help prevent_______.

If people follow rules without taking other matters into consideration, it will be _______for them to form what is sometimes called a “black and white” view. For example, they may believe that people should always tell the truth, and that lying is_______ acceptable. Such people always stick to their views, even if it means that they may get into_______.

Sometimes it may not be so easy to know_______what is right or wrong. Some people choose not to eat meat because they believe that it is _______ to eat animals, but others argue that they can eat meat and ________ be kind to animals; some insist that stealing is always wrong, but others think that one does not need to feel to________ when stealing some food to eat, if lives in a really poor area and he is________ . Rules help us live together in harmony, because they show us the right way to________ other. However, some people argue that rules may be ________, having observed that rules change all the time, and that some schools have some regulations and other have different ones — so who is to ________what is right?