Explanation: (You didn't mention the instructions, but since I know Spanish, I believe these are the most accurate answers)
Part 6
1. el que
2. la que
3. el que
4. los que
Part 7 (your own answers, I'm just translating in case you need it)
1. What I need is...
2. What I want is...
3. What I like is...
4. What I prefer is...
5. What they're telling me is...
Part 8
1. cuyo
2. cuyas
3. cuyos
4. cuya
5. cuyo