题目内容：

    For a long time bats  1.(be) one of the most feared creatures in the animal kingdom. Many pop culture associations with them are2.(relate) to vampire. Though these associations are  complete misunderstandings, bats do have a dark side as a  3.(danger) disease vector (传播媒介). So there is good reason to be exceptionally cautious if you come into contact with bats. However, the fact is4.bats play a significant role in keeping a balanced ecosystem.

Many organic farmers have learned about the benefits of   5.  (have) bats nearby to help manage the amount of pests that show up without pesticides. One brown bat - about      6.size of a human thumb - can consume about 600 mosquitoes and other unwanted insects within an hour. They make for a fantastic, almost essential  7.  (add) to pest management on any farm.

Even large government organizations have realized the economic benefits of bats. The United States Geological Survey estimates that bat contributions8.pest management save the country at9. (little) 3.7 billion dollars per year. Without them, we would likely experience a dramatic drop in  food production, which would eventually make10.(it) way into our weekly grocery bills.