Complete the sentences with mustn't or the correct form it's not have to. 1. you mustn't smoke at petrol stations 2. she come is she doesn't want to 3. we miss the train. it's the least one tonight. 4. i do this work tonight. i can do it tomorrow. 5. i clean the floor today. i cleaned it yesterday. 6. we forget to lock all the doors before we go away. 7. they sit in the sun for too long. they might get burnt. 8. we stay in a hotel in london. wet can stay with my cousin. 9. he come home too late. he's got an important day tomorrow. 10. we spend too much money tonight. we've only got a little left.