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