题目内容：

In many countries,1.(smoke) is becoming a bigger problem for young people. Most smokers2.  (start) in their teens (years of a person's age from 13 to 19 ) or even earlier.

A study of 8,000 Beijing students last May3.(show) us that smoking was a problem for many Chinese kids. More than 21% of middle school students and 6% of primary school pupils(小学生) said they had smoked.

"If young people start4. (smoke) early, they will probably get addicted to nicotine (对尼古丁瘾).And it 5.  (be) very hard to give up(放弃) later on," said a professor.

Every year, about 4 million(百万) people die (死亡) of smoking. And if people keep 6.(smoke), that number will go up to about 10 million a year by 2030, the World Health Organization (WHO, 世界卫生组织) says. So we have to 7.(know) and tell others about the dangers(危险) of smoking. Every one of us should 8.(do) something useful to stop kids from9. (smoke), or one day we10. (see) what we won't see.