III. Fill in each blank with a suitable preposition.
1. That's very kind...................you to help me...................this math problem.
2. Our group is planning to help the community...................encouraging all members to participate................... a recycling program.
3. We hope to earn some money...................our school Y & Y.
4. To be member of our organization, you can register...................today.
5. My father is good...................gardening.
6. I am had high marks...................exams...................working very hard school.