2,4,6

Certainly dustmen prefer to be known as ¡°Refuse Collection and Disposal Officers¡±. You may think that this is rather silly, and that it is better to call a spade. But dustmen can be just as sensitive as people of any other occupations, though we must admit that their job is not the most romantic one in the world. We often take dustmen for granted. Perhaps because they usually come very early in the morning, before most people are up, we are inclined to forget that they exist. Our dustbins are emptied regularly, but we rarely stop to think about the men who do this. However, it is one of the most important jobs in the world, and when there are no dustmen         , the general public soon becomes aware that something is wrong.