I. Which of the sentences have mistakes?

1. If I have this tool, I would give it to you.
2. If my boss were open and accessible, I would enjoy my job.
3. If we had known you were on your business trip, we would contact you by e-mail.
4. If our manager had known the whole story, he would not have fired you.
5. If I will meet him, I will let you know.
6. Unless you find the job, I will help you.
7. If I was you, I would not miss this opportunity.
8. I wouldn’t left the office yesterday night if I hadn’t finished my work.
9. I won’t be able to call you unless you don’t give me your number.
10. If there are a lot of people at the meeting, nobody will notice his absence.