Помогите! Нужно исправить ошибки.

1. When did you leave school?2. How long has she been feeling unwell?3. I've never met such a nice person before.4. I've been waiting for you since four o'clock.5. She has never written a letter by hand since she bought a computer.6. I wonder where you have been all this time.7. I have been learning English for five years.8. You never know how he was going to react.9. She has tripped over the cat and nearly fell over.10. Look! I've found a ten-pound note! — Where have you found it?11. Margaret is taking driving lessons now.12. In recent years terrorism has become a greater threat.13. The rain came suddenly and soaked all the washing.14. Ever since we met, you have never asked me what I prefer to do.15. How long have you lived here?16. I have been interested in sports since my childhood.17. What have you been doing since you left Cambridge?