다음 중 <보기>의 밑줄 친 that과 어법상 쓰임이 같은 것을 모두 고르세요.
<보기> Gary is the kindest man that I know.
① If you want, you can get that book.
② He’s the boy that showed me the way.
③ Kate insists that I should help them.
④ The old box was the only thing that he had when he died.
⑤ I signed up for a dance class that starts at five on Fridays.