将下列句子改为间接引语。
1. "Go to the front at once!" the officer said to the soldiers.
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2. The teacher said to his class, "Don't waste your time!"
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3. She said to her son, "Don't forget to turn off the light when you leave the room!"
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4. His father said to him, "Think before you do it!"
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5. The teacher said to his students, "Tell briefly in your own words how penicillin was discovered."
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6. The leader said to him, "Please write your report as soon as possible."
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7. He said to me, "Let me have a look at the book you bought."
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8. "Don't risk your lives, men!" the captain warned.
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9. She said to me, "Have lunch with us."
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10. "Be careful, and don't cut your finger," he said to me.
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