用适当形式填空：I’m often _________(警告）not to copy others’ homework.
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用适当形式填空：He couldn’t explain why dinosaurs ___________ (消失).
用适当形式填空：I’ll have my bike __________________(修理) tomorrow.
用适当形式填空：Have you found your necklace ________(偷) last week?
用适当形式填空：The PRC was _________(成立) on October 1, 1949.
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