다음문장의should와 쓰임이 같은걸 고르세요
First of all, your objective should be clear in your mind.

1.Sungjun worked hard lest he should fail the exam.

2.It is necessary that Hyunji should study English all day long.

3.Mina insisted that he should finish his homework.

4.Sungdok should have achieved his goal.

5.What would you do if you should go there?
답안지가 이상한건가 해서 질문드려요
각 문장의should용법의 설명부탁드려봅니다~~