When we often interrupt a person who's speaking to us, we're likely to give the impression that
a. we're knowledgeable about the topic of discussion.
b. we're really interested in what the speaker is saying.
c. we want to hear more about the topic being discussed.
d. we aren't really listening to what the speaker is saying.

in contrast, the biological controls are self-sustaining, inexpensive and very effective once established. biological control could be used on thousands of golf course acres, improving their biodiversity and quality as wildlife habitat. in the process, the golf industry will be shown to be leaders in an environmental stewardship program of benefit not only to the lands they manage but also to the watersheds in which they exist.