I.
9. What you (do) when I (call) you?
⇒ What were you doing when I called you ?
10. I (not meet) her since I (leave) school
⇒ I haven't met her since I left shool
II.
1. Healthy
2. Weigh
3. Flight
4. Helpful
5. Admittance
6. Unfriendly
7. Interesting
8. Comfortable
9. Conclusion