Question

Choose the correct modal verb.
1. A: Are you on a diet?
B: Yes, the dietician says I must/have to eat lots of fruit.
2. A: You mustn't/don't need to buy tickets. Entrance is free.
B: Really?
3. A: You shouldn't/mustn't enter this room.
B: I'm sorry. I didn't see the sign, sir.​

Answer 1

1.i have to eat lots of fruit

2.you don't need to buy tickets

3.you mustn't enter this room