将下列句子变为间接引语。
1. "You should be more careful next time," his father said to him.
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2. Mr. Wang said, "I will leave for Shanghai on business next month, children."
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3. "I haven't heard from my parents these days," said Mary.
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4. The geography teacher said to us, "The moon moves around the earth and the earth goes round the sun."
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5. She said to him, "It's time that you left here."
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6. Zhang Hong said to me, "Doctor Wang passed away in 1948."
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7. John said to his parents, "I had learned 500 Chinese words by the end of last term."
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8. The history teacher said to them, "The Chinese Communist Party was founded on July 1st, 1921."
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9. He said, "Are you a student?"
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10. "Have you anything interesting I can read, Ceorge?" she asked.
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