어법상 기능이 다른 하나를 고르시오.① The cottage had a living room and two bed rooms.
② Fill the tea pot with boiling water.
③ The bath room is surrounded by a veranda and changing rooms.
④ We are short of drinking water.
⑤ I heard her singing a song in the room.

여기서 답은 1번이라고 되어 있는데.. 왜그런건가요..???? 1번과 3번의 차이점은 무엇인가요?
답변 부탁드립니다~!!!!!