For or Since?

Remember the meaning of the 2 prepositions:FOR= during a period of timeExample: I have studied FOR one hour.SINCE= from the past till nowExample: I have gone to Beth School SINCE I was a little kid.Write FOR or SINCE in the following sentences or questions 1. My parents have lived in Buenos Aires since 2003.2. My cat hasn't eaten anything since yesterday.3. My sister has kept a private secret for two years.4. My uncle hasn't been on holiday since last December.5. You have slept for ten hours!6. We have been waiting for a taxi for half and hour.7. I have been studying for a long time.8. Things have changed since the beginning of the quarantine.9. We have been in Beth school for more than five years.10. My cousin has been at home since 9 o'clock.11. We live in Buenos Aires now, but we lived in Cordoba for a few years.12. Argentina hasn't won the football World Cup since 1986.13. I have been having football lessons for three years.14. My oldest cousin studied in New Zealand for six months.15. I have shared my bedroom with my sister for two weeks. Choose the correct answer for each sentence16. We haven't seen each other _ last year. since for at 17. My youngest brother has had temperature _ two days. for on since 18. I study English _ one hour every day. in for at 19. She paid for lunch _ advance, so we don't need to pay now. since in for 20. I have lived in the same house _ I was born. for at since