관계대명사와 관계부사 중 무엇이 맞나요?

아래 문장에서 빈칸에 알맞은 관계대명사나 관계부사가 무엇인지 궁금해요.
Is this address to ______ you want the package sent?
He was accompanied by the men, all of _____ were wearing masks.
It was the result of six years during ____ he had been painting.