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Could anybody correct these sentences for me?
(1) Our school advocate ________________(hope everyone changes their habits or do something to protest our environment ),so there are many kinds of plants in our school.
(2) I like to write sentences beside the mountain in the evening.(I put the because I refers to the mountain in our school.)
(3)The mountain in/on/at our school are greenish with tropical trees and animals.
(4)Further more, there is a beautiful waterfall and pond at the summit of it.

Many thanks in advance
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I'm not sure what you want to do with #1, but:

(1) Our school advocates changing our habits or doing something else to protect our environment, so there are many kinds of plants in our school.
(2) I like to write sentences on/under the hill in the evening. -- A school would have to be very, very big to have mountains; I think that yours has a hill.

(3) The hill at our school is green with tropical trees and has many animals.
(4) Furthermore, there is a beautiful fountain and pond at its summit.-- That is an impossible place to have a waterfall, although there could possibly be a pond. Do you mean a fountain?
Comments  
Thanks,
I mean this.

Many thanks in advance