Ex1 : Điền vào mỗi chỗ trống với can , can't , must hoặc mustn't:
1 : We .......... slow down on busy streets
2 : All the students ............. be on time
3 : I ......... go to school on today . I'm not fine
4 : There are many accidents on the roads . We .......... have discipline
5 : When we ride a motorbike . We .......... go ahead if the traffic light is green and we ....... if the traffic is red
6 : You have a lot of homework . You .............. phat video games now
7 : The lights are red . You .......... stop
8 : We .......... go very fast on the roads . It's dangerous.
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