문제 내용: 밑줄 친 부분에 들어갈 말로 가장 적절한 것을 고르시오.
선택지 1: A: You were the last one who left the office, weren't you?
  B: Yes. Is there any problem?
  A: I found the office lights and air conditioners on this morning.
  B: Really? Oh, no. Maybe I forgot to turn them off last night.
  A: Probably they were on all night.
  B: ①
선택지 2: ① Don't worry. This machine is working fine.
선택지 3: ② That's right. Everyone likes to work with you.
선택지 4: ③ I'm sorry. I promise I'll be more careful from now on.
  ④ Too bad. You must be tired because you get off work too late.