문제 내용: 두 사람의 대화 중 가장 자연스러운 것은?
선택지 1: A: Do you know what time it is?
  B: Sorry, I'm busy these days.
선택지 2: A: Hey, where are you headed?
  B: We are off to the grocery store.
선택지 3: A: Can you give me a hand with this?
  B: OK. I'll clap for you.
선택지 4: A: Has anybody seen my purse?
  B: Long time no see.