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1. He said nothing. (同義句)
    He ________ say ________.
2. He is good at his lessons. (同義句)
    He ________ ________ in his lessons.
3. We have cleaned the blackboard. (變?yōu)橐话阋蓡柧?
    ________ you ________ the blackboard?
4. He has been a doctor for seven years. (對(duì)畫線部分提問)
    ________ ________ has he been a doctor?
5. Let's have a rest, ________ ________? (完成反意疑問句)