1 . I can’t speak for everyone, but I ________ speak for myself. （用适当的词填空）

2 . 在空白处填适当的情态动词。
1. “Look at these tracks. It ______ be a wolf.” “Don’t be so sure. I think it ______ be a fox.”
2. I didn’t see her in the meeting room this morning. She ______ have spoken at the meeting.
3. It’s a very kind offer, but I really ______ accept it.
4. The boss said to the secretary, “If you work well, you ______ have a rise.”