Losing a baby tooth can be fun for a kid. You can put it under your pillow and look forward to finding some money there in the morning. And then you can watch your new permanent(永恒的) tooth grow in its place.

But if a permanent tooth falls out, that’s a problem. There isn’t another one under the gum(齿龈)that can replace it. Unfortunately, this happens to some older people. And if permanent teeth fall out-or need to be pulled-an older person might need dentures.

Dentures, known as false teeth, are a set of replacement teeth for any teeth that are missing. There are partial dentures, which take the place of only a few teeth and prevent the others from changing position. If all the teeth are gone, the person would need complete dentures, which replace every tooth in the mouth.

Dentures can cause pains at first and take some time to get adjusted to. They also need special care. They should be brushed daily with a special denture brush and cleanser and soaked in denture solution when not in the mouth.

Dentures are important for older folks because, without teeth, it’s hard to smile, talk, and eat properly. But it can be a little weird if you see someone take out his or her dentures. It can also be strange to see someone, like a grandparent, without dentures in because he or she won’t have any teeth. Try not to make fun of the person because this could cause hurt feelings.

People usually lose their permanent teeth due to periodontal disease, or gum disease, which is caused by bacteria that attacks the gums. Diseased gums aren’t strong and healthy, so teeth can get loose and fall out. Older people often have many cavities(洞)that have been filled over the years, and these fillings can weaken over time, leading to more tooth decay(腐烂).

1.If one of your baby teeth falls out, he or she       .

2.A person wearing dentures      .

3.Which of the following is NOT true according to the passage?

4.What does the underlined word “weird” mean in the fifth paragraph?

Barack Obama, who came into _________ power on January 20, 2009, was awarded _________2009 Nobel Peace Prize.

         A. the; the                           B. the; /                               C. /; the                               D. /; /

That car accident _________all his life. After that he was limited to a wheelchair.

         A. damaged                        B. destroyed                       C. harmed                           D. ruined

Nowadays in China many teenagers have no dream _________to be an astronaut and fly to the moon.

         A. rather than                    B. more than                      C. other than                      D. less than

I did love my mom very much but it got to a point _________even she did not want me to see her as she was.

         A. where                              B. when                               C. that                                  D. which

 They supply Chinese tea and there are several kinds of different _________according to different seasons and personal interests.

         A. hobby                              B. choice                              C. taste                                D. love

_________the authorities continue to crack down football betting _________a new hope in the future.

         A. If only; Chinese soccer can see                               B. Only if; can Chinese soccer see

         C. Even if; can see Chinese soccer                              D. Only if; see Chinese soccer can

 _________that developed countries want to limit the development of the developing countries in the climate conference in Copenhagen.

         A. It is no possibility                                                        B. It is small wonder

         C. There is no denying                                                    D. There is no chance

_________with so many contributions to the newspaper, he has little time to chat with friends on the net.

         A. Occupied                        B. Have been occupied    C. To occupy        D. Having  occupied

The man had expected to see all his relatives when in hospital, but _________ came to see him while  many of his friends offered him their help.

A. none                                B. no one                             C. someone                        D. anyone