Exercise 3. Rewrite the following sentences without changing the meaning
1. It is wrong of us to throw rubbish.
 We mustn’t ____________________________________________
2. It is not good to stay up so late to listen to music.
 You shouldn’t __________________________________________
3. It is essential that you do your homework before going to school.
 You must ______________________________________________
4. You look so thin. It’s necessary to eat much to gain your weight.
 You should ____________________________________________
5. It is essential that you close the door before going out.
 You must ______________________________________________
6. It's not allowed to park here.
 You mustn’t __________________________________________