토익 문법 문제 답이 되는 이유가 궁금해요

토익 문법 문제 답과 이유를 알고 싶어요.
1. ( ) the order was made after the specified date, a discount will not be given.
선택지: Yet, During, However, Because
답은 Because입니다.
2. If there is ( ) raising questions concerning those figures, please escort him or her to me.
선택지: anyone, whoever, these, what
답은 whoever입니다.
3. If the products and services ( ) the standards, the board members will be delighted.
선택지: meet, had met, to meet, will meet
답은 meet입니다.
각 답이 맞는 이유를 설명해주실 수 있나요?