从方框中选用合适的动词并用其适当时态填空。
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1. David is a polite student. He never ____________ with others.
2. ---Where is Jack?
---He ____________ the floor in the classroom.
3. --- ____________ the police ____________ out who stole the money?
--- No, not yet. But they are busy doing it.
4. We ____________ a party to celebrate Christmas next Sunday, shan’t we?
5. His uncle often ____________ to Beijing in the past.