문제 내용: A: Have you found your phone?
  B: Unfortunately, no. I'm still looking for it.
  A: Have you contacted the subway's lost and found office?
  B:
선택지 1: I went there to ask about the phone
선택지 2: I stopped by the office this morning
선택지 3: I haven't done that yet, actually
선택지 4: I tried searching everywhere