1. that combination produces what we call it luck.
밑줄친 문장이 왜 틀린지 모르겠어요..

2. receiving was from someone (whom/whose) we have never even met.

3. at the time, we (have/had) been married for thirteen years!

2,3번은 뭐가 답이고 그 이유가 먼지 잘 모르겠어요ㅠㅠ
도와주세요..