情态动词表推测（must/might/could/can't） — 英语词汇题
题目
根据句意和中文提示，补全单词：1. The schoolbag must b______ to Lily, because her name is on it. 2. I'm not sure; it m______ be Tom's hat. 3. That can't be Mary's coat—hers is red, but this one is blue. 4. The book couldn't be John's; he d______ like reading.（每空一词，用本单元表示推测的情态动词或首字母补全）