11. If you’re sitting around a lonely campfire at night, the howl of a wolf can sound pretty ______.
A. fearful 
B. threatening
C. dreadful 
D. frightening

12. The suspect cooperated fully with the police when ______ about his role in the incident.
A. required
B. questioned
C. demanded
D. negotiated

13. Homing pigeon is useful as a ______ carrier because when taken from home, it will return at the first opportunity.
A. meaning
B. information
C. message
D. content

14. One of the responsibilities of the Coast Guard is to make sure that all ships ______ follow traffic rules in busy harbors.
A. conveniently
B. obediently
C. sufficiently
D. reluctantly

15. She was so ______ the noise that she sent the children to bed.
A. broken down by
B. filled in with
C. taken over by
D. fed up with