I recommend that you talk to your friend about his behavior. It is not unusual for teenagers of your generation to     1     computer games and the online world. But spending too much time online is unhealthy and makes it very difficult to focus on other things in life. Some students even     2     the Internet and cannot     3     school and family life.

The shopping mall,     1     (很多人喜欢它的环境), was on fire last week because the gas pipes     2     (使用太长时间的) cracked. Those     3     (正在里面购物的) were trapped. Many goods     4     (正在销售的) were destroyed. This was the biggest fire     5     (人们曾看到的). Luckily, the firefighters     6     (收到紧急电话的) came at once. They did all     7     (他们能做的) to put out the fire. To our relief, no one was injured or dead.