1) clean and green is our perfect dream.
2) look around,walk around,breathe clean air and don't litter the ground.
3) keep your campus clean and green for the future generation to be seen
4) don't be a litterbug just give a tree hug
5) keep it clean keep it green
6) don't litter it makes the campus bitter
7) keep your surroundings clean,make the campus green
8) anti-litter,dnt be bitter,stop this litter
9) cleanliness is half of the campus
10) cleanliness is next to the godliness...