Yesterday we had a discussion about Coach Mila’s book. We talked about the good habit of picking up litter. I heard some people here hold this opinion: street‑cleaners’ job is to clean rubbish. If we do not leave rubbish on the ground, they will have no work. So they believed they have the right to leave litter. I disagree, but I did not know what would be a proper reply to argue against them.......