The key to exercise solutions in chapter S - Starter test for the textbook Step Up Gold 3 with authors Philippa Bowen e Denis Delaney from Oxford University Press
Question
Complete the sentences with must or mustn't and a verb from the box.
Answer
You must show your passport at the airport.
You mustn't run next to the swimming pool.
In many countries, you must wear a helmet when you ride a bicycle.
You must buy a ticket before you get on the train.
You mustn't use your mobile phone when you're driving.
You mustn't talk to the driver when the bus is moving.