hi all, thx if u would like to help me solving these problems.
please check is there any mistake here? i'm poor at grammar

1. The committee
debate these questions carefully.
2. The committee
leads very different lives in private.
3. The Prime Minister, together with his wife,
greets the press cordially.
4. All of the CDs, even the scratched one,
is in this case.
5.
Is my boss or my sisters in the union going to win this grievance?
6. Some of the votes
seem to have been miscounted.
7. Some of the grain
appear to be contaminated.
8. Three-quarters of the students
are against the tuition hike.
9. Three-quarters of the student body
is against the tuition hike.
10. A high percentage of the population
is voting for the new school.
11. A high percentage of the people
were voting for the new school.