Complete the sentences using can, have to / must, or can't / mustn't.1. Don't jump the queue. You _______ wait your turn.2. I _______ feed my dog many kinds of food, but I _______ give him chocolate. It is badfor him!3. A: Can I leave the classroom if I don't feel well?B: Yes, but you _______ tell your teacher about it when you _______ be absent fromclass.4. A: Hey! Can I look at your book?B: Shh, we _______ talk quietly in the library.5. A: Can you put on your seat belt? We _______ wear one when we're in a car.B: Sure. Thanks!

步骤 1：理解句子含义
- 第一句是关于排队的规则，表示必须等待。
- 第二句是关于喂狗的规则，表示可以喂很多种食物，但不能喂巧克力。
- 第三句是关于离开教室的规则，表示可以离开，但必须告诉老师。
- 第四句是关于在图书馆的行为规则，表示必须安静。
- 第五句是关于在车上的安全规则，表示必须系安全带。

步骤 2：选择合适的动词
- "have to" 或 "must" 表示必须做某事。
- "can" 表示可以做某事。
- "can't" 或 "mustn't" 表示不能做某事。

步骤 3：填空
- 第一句：You have to / must wait your turn.
- 第二句：I can feed my dog many kinds of food, but I can't / mustn't give him chocolate.
- 第三句：Yes, but you must tell your teacher about it when you are absent from class.
- 第四句：Shh, we have to / must talk quietly in the library.
- 第五句：We have to / must wear one when we're in a car.