이해가 잘되지않아 도움을 청합니다. 중간고사 시험 공부하고있는데 설명도 좀 부탁드립니다.
1. 다음 밑줄친 부분의 쓰임이 나머지와 다른것은?
①it is in the zoo that we can see elephant,.
②it was ann that lived with jenny.
③it was tom that i met yesterday.
④it is certain that she will come back soon.
⑤it was the monkeys that minji saw in the park.
다 맞는것 같은데 구분하는 방법을 모르겠어요 ㅠㅠ

2.다음 두 문장이 같은 뜻이 되도록 가목적어 it을 사용하여 빈칸을 완성하시오
it was possible to solve the problem because of the key.
=the key made ( )