A. quiet B. a large number of C. all day long D. noisy E. live on F. friendly G. sounds

The crow is an ordinary bird. It is about twenty inches long and black all over. Crows are dirty birds because they 【1】 old bad food. Crows eat a lot of waste food. In this way they are more useful to us than any other birds. They clean up the dirty things in our streets. Crows are always hungry. They look for food 【2】 , and in the evening you can see them in large numbers flying back to their nests in the trees. They sleep there at night.

Crows are much noisier than other birds. Very often 【3】 crows will get together on one house and talk. Sometimes they talk together, and sometimes they do it by turns like human beings. It is easy to tell from crows’ 【4】 whether they are pleased or angry.

Perhaps crows talk a lot because they are 【5】 birds. A pair of crows will live together all their lives, and if one of them dies, the other one becomes very sad and 【6】 for the rest of its life and sometimes it dies, too.