Fill in the gaps with mustn't or needn't/ don't have to. 1 A: You ...mustn't... do that again! It was very naughty! B: I'm sorry. 2 A: Shall I put some petrol in the car? B: No, you ........................ I did it this morning. 3 A: You ................................. be late tonight. B: I won't. I'll be home early. 4 A: Shall I give you a lift? B: No, you ........................ I'll go by taxi. 5 A: You ........................... forget to pay the bills today. B: I've already done it. 6 A: You ........................... lose the money I gave you. B: I'll put it in a safe place. 7 A: You ........................... buy a gift for Daisy's birthday. B: Alright. I'll just send a card. 8 A: Shall we take a picnic with us on Saturday? B: No, we ........................... We're going to eat at a restaurant.