Ответ:Here are the completed sentences using must/mustn't, have to/do (doesn't) have to, need (not):

1. I think you **mustn't** wear that dress. It doesn't suit you.

2. You **mustn't** drive in the fog. It's really dangerous.

3. You **don't have to** do the ironing. I'll do it later for you.

4. Don't tell me what I can or can't do. I don't **need** any advice from you.

5. It's really important that you do it. You **mustn't** forget about it.

6. The next bus is due to arrive in 15 minutes, so we don't **have to** hurry.

7. Ilona is a very rich person, and she **doesn't have to** work.

8. Gustav won the first prize. He **must** be very happy now.

9. In our country, you **must have** a driving license to drive a car.

10. It's very cold during this season. I think you **must put on** a warmer coat.

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