1. I just have cut my hair.

-> just have cut

2. She has not working as a teacher for almost 5 years.

-> worked

3. The lesson haven’t started yet.

-> hasn't

4. Has the cat eat yet?

-> eaten

5. I am worried that I hasn’t still finished my homework yet.

-> haven't

6. I have just decidedto start working next week.

->  decided to

7. He has been at his computer since seven hours.

-> for

8. She hasn’t receivedany good news since a long time.

-> received

9.My father hasn’t playedany sport for last year.

-> played

10. I’d better have a shower. I hasn’t hadone since Thursday.

-> haven't