A smile shows that a person is happy. For example, you may smile when you are pleased with a grade on a ________. It is often said that people are supposed to smile a lot. The following may ________ why.

First, it is ________ to smile than to show unhappiness. In fact, only 17 muscles (肌肉) are needed to smile while 43 muscles are needed to show unhappiness.

Second, you look more ________ when you smile. You may try to look nice ________ exercising or wearing nice clothes. But a smile is the best thing a person can ________.

Third, smiles are helpful. Both smiling and laughing can quickly ________ from one person to another. If one person smiles or laughs, people around him or her want to smile or laugh, too. If a person is sad, the best thing you can do is to ________ a smile or laugh. It is the easiest and cheapest way to help him or her be happy.

Finally, smiling and laughing are very good for the ________. Study shows that a good mood (情绪) ________ a lot if you want to keep fit. So, even if you are mad or sad, try to smile. You’ll find it difficult to stay mad or sad for very long. And then, you will know that smiling does good to your body.

Work is helpful to health. Scientists find that the hard-working people live longer than those who have no _______. Studies show that the jobless are in better health than job-holders. Career（职业）women are healthier than _______.

_______ is work good for health? It is because work _______ people busy, away from loneliness （孤独）. Researchers show that people feel unhappy and worried when they have _______ to do. Instead, the happiest people are those who are busy. Those who are successful feel they are _______ when they are working hard. They work as a bridge _______dream and reality（现实）, so they have energy（精力） every day. By work, people get to know each other. By taking part in all kinds of activities, they find friendship and warmth. This is helpful to health. Losing your job_______ losing everything. It will make people sick. Even taking medicine won't help.

Besides, work brings people success. Work makes one feel his value and status（地位）in society. When a _______ finishes his writing or a doctor successfully operates on（对……动手术）a patient or a teacher sees his students grow, they are very happy.

All in all, the studies tell us that the __________ you work, the happier and healthier you will be.