Possible version

Before graduation, we decide to give a gift to our school for its birthday. We had a heated discussion about what gift to give. We think we should do whatever we can to help our school. Some advise planting more trees on the coming Tree---Planting Day to make our campus more beautiful, while others hold the view that we should introduce the history of our school to friends, schoolmates or relatives. Besides, we can show them around our school to make it better known.
As far as I am concerned, I'd like to study even harder for a better university. In this way, our school will be proud of us and thus we can make an even greater contribution to it.