第二节语法填空（共10小题，每小题1.5分，满分15分）
阅读下面短文，根据上下文填入适当的词语，或使用括号中的词语的适当形式填空，并将答案填写在答题卡上标号为31-40的相应位置。
Jean is a 17-year-old high school student. On Saturday mornings, Jean and her friends take part in the program    31       (call) SAVE THE KIDS. They travel to a poor area of Washington D.C.  They help younger students learn    32     to read and to solve mathematics problems. Many American teenagers join in programs    33        serve their communities. On weekends Jean sometimes works at an ice-cream store. When she is not working, she gets together with her girlfriends. They might go to a movie, to a shopping mall or to an eating place. Or they might attend    34      sports event of their high school. They also often stay at one girl’s house for the night.
35    teenagers in most parts of the country, Jean began driving a car when she was 16 years old. She does not have her car, however. She must    36     the family car with her parents. About 70 percent of American teenagers have their own cars. Many of them drive their cars to school every day. Jean does not smoke cigarettes   37     drink alcohol.   38    do her friends. But many teenagers at her school do. Drinking alcohol is a major problem there. Every weekend teenagers have parties, where they drink alcohol. Then they drive to other parties. People under the age of 21   39         (not allow) to drink alcohol in the United States. And it is    40          (danger) to drink and drive a car. Yet this does not stop some teenagers.