Complete the following sentences with indefinite pronouns

1. Are there any letters for me? 2. Someone is knocking on the door. 3. Does anyone here speak German? 4. Any pupil can answer that question. 5. Someone is waiting for you downstairs. 6. I have got someone good news for you. 7. Someone had been here before us. 8. If you have any questions, ask me. 9. I don't know anything about it. 10. Come any time you like. 11. Anyone should not neglect one's duty. 12. This copy is torn. Bring me another one. 13. Put some sugar in my tea, please. 14. He never puts any sugar in his coffee. 15. Someone left the light on in the corridor all night. 16. Let me know if something happens.