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※ 다음 글을 읽고 물음에 답하시오. (1-3)

Mike : Su-jin, (a) what happened?

     You are always late!

Su-jin : I know. It's my (b) _____________.

Mike : Yes, it's a big (b) ___________. Can you change?

Su-jin : I try, (c) ________ it's very hard. What can I do?

Mike : You need a special machine. It will move you anywhere in a second.

1. 밑줄 친 (a)와 바꿔 쓸 수 없는 것은?

① What's up?          ② How old are you?

③ What's the matter?  ④ What's the problem?

⑤ What's wrong?