保持校园的洁净使我们的责任用表达英语

it is our duty to keep campus clean
we should try our best to deal with the challenge that we are going to meet
it is helpful to remenber pop music by heart
time lapse,but Friendship Forever
it is diffcullty for him to make sentences

It is our duty to keep schoolyard clean.
We should try our best to deal with the challenges we meet.
Remembering some pop songs is helpful.
Though time goes by,friendship lives forever.
He has some difficults to make full sentences.