請依下文回答第 36 題至第 40 題：
    There’s more to a firefighter’s job than extinguishing fires; firefighters also respond to emergency and save people’s lives. Firefighters   36   with their local community to increase their awareness of fire safety. In addition, they are also responsible for   37   fire safety standards by conducting practice drills and other trainings in public and commercial premises.
    Working as a firefighter means that you are the direct frontline representative for your respective department or team. It is essential that you know how to   38   your attitude especially in handling situations. A firefighter must know how to remain calm and at the same time know how to stay   39   . Firefighters are considered as the problem solvers and life savers in times of fire   40   , which is why it is very important for them to have extensive knowledge and experience in this kind of work.
【題組】36
(A) operate
(B) conceal
(C) obstruct
(D) cooperate