1. Complete the sentences with must/mustn’t.
1. It is raining. You ………….take an umbrella or you will get wet.
2. You……………follow the instruction if you don’t want to have anything wrong with that machine.
3. This is secret. You………….tell anybody.
4. You………………make noise in the library.
5. Students at high school…………..use the phone in class.
6. Look at the speed limit. You………….drive at more than 40 km/ hour.
7. You……………walk on the grass in the park.
8. You………………be late for class if you don’t want to be punished.
9. Passengers ……………...fasten their seat belts while on the car.
10. You…………………..speak loudly in the hospital.