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