7.
听录音,在横线上填入所缺单词,完成短文。
Our city isn't now. from cars makes the air . Rubbish makes the streets . What should we do to our city? We can walk to school. We shouldn't rubbish anywhere. We should put rubbish in the . We can more trees. We shouldn't too much. We shouldn't use too much . Then our city will become more beautiful.