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1. 다음 중 밑줄 친 it의 쓰임이 나머지 넷과 다른 것을 고르시오.
①It's easy to solve this problem.
②Is it OK to buy things on the Internet?
③It's important to keep the air clean.
④It's good for your health and brain.
⑤It's difficult to park this car.