Flies are very annoying insect in summer for three reasons. First,  flies carry herm and disease like cockroaches. It is a reason that makes food get bad. Second, flies are very dirty because they like to visit or live in trash. It is so disgusting. Third, the sound of flying is terrible to tired people under the strong sun. Flies are difficult to catch, and whenever invade people’s space, so people can’t be away from it.