Chọn 1 từ thích hợp để hoàn thiện các câu sau: 1. In case you're suffered from the injury, you ____ see the doctor today. A. had better B. must C. ought D. have better 2. In the peak season, travellers ____ book their accommodation in advance. A. have to B. must C. should D. ought 3. If you still want to maintain this relationship, you ____ behave improperly like that. A. ought to not B. ought not to C. mustn't D. don't have to 4. When playing or swimming in the pool, children ____ be accompanied by their parents. A. should B. must C. don't have to D. have to

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