Some people drop things everywhere. They drop paper in the streets. They drop bottles in the parks. This makes the streets and parks very dirty. But many of the things are useful. We shouldn' t throw them away.
It' s Sunday. There are many pupils in the park. They are picking up useful things.
Mike and Li Lin are picking up bottles. Jill and Liu Xin are putting them into a bag. How many bottles are there? There are forty-eight.
Mary and Meimei are picking up paper. Ann is putting the paper into a bin. How much paper is there? About half a kilo.
The pupils are doing a good job, and they are very happy.