一、2 4 1 3
二、1、safely
2、quickly
3、waits
4、left
5、except
三1、must
2、mustn't
3、Can,can't,must
4、must
5、mustn't
四、1、I can't find a zebra crossing near me.
2、Must,follow,Yes,must
3、Why must you go to see the doctor?
4、 keep quiet/listen to the teachers,talk/eat or drink