IV.
1. has failed
2. established
3. have they lived - moved
4. have finished
5. am studying
6. did you buy - bought
7. Have you ever been - haven't been
8. volunteering
9. to help
10. donating
V.
1. service
2. disabled
3. organization
4. donation
5. unprofitable
6. voluntary
7. chairity
8. older