Помогите пожалуйста,1-ое задание

1. I have chanched my job. Why? I did not like the hours,
2. Look i found some information. Where did you find it?
3. Michael have already lost his new watch.
4. The company lost a lot of money last year.
5. Have Alex spoken to the teacher yet?
6. It have not snowing since Friday.
7. You can have the book. I have finished it.
8. I have studying pysics for 5 years.
9. How long have you been  waiting for us?
10. The girls have made a lot of biscuits.