将下列句子改为间接引语。 1. "Go to the front at once

问题：

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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