q. 다음 중 어법상 맞는 문장은?

1) it is natural that he attended the meeting.
2) he insisted that the car accident take place on the crosswalk.
3) you had not better go there.
4) i would rather fight to the end than giving up.
5) it is necessary that he keep his promise.

답 : 5번

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제가 보기엔 5번도 keeps 써야 하는 것 같은데...?

1번부터 5번까지 문법 오류 설명 부탁드립니다!

(어설프게 아는 것보단 하나 하나 짚어보는 게 중요하잖아요! ㅎㅎ)