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1. He gave us some beautiful cards. (一般疑問句)
                he             you             beautiful cards?
2. Do it like this. (否定句)
                            it like this.
3. May I watch TV now? (否定回答)
    No,                        .
4. It's iateresting work. (感嘆句) 
                            work it is!
5. My grandfather takes good care of his pet. (同義句)
    My grandfather                         his pet            .
6. Let's walk to the summer palace tomorrow. (同義句)
    Let's            to the summer Palace                       tomorrow.
7. Elephants walk on tiptoe. 
                           elephants walk? (劃線提問)
 8. Millie could swim when she was ten. (劃線提問)
                            Millie             when she was ten?

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A. mustn't
B. must
C. need
D. can't