He didn't know ___ use it was made of since he was too young

He didn't know ___ use it was made of since he was too young He-------------（know）the city since he was very young. John lived with her mother when he was young. He didn’t know Mr white didn't know i was inhis office.He was too busy to n He was made ___ of the workshop Since he was made ___ director of the sales department,there it appeared that he didn't know what was happening=he()()to 翻译：He meant what he was saying ,but I don't know why it didn He didn't see the bag until it was too late 其中 it 指什么 It was an＿＿question,so he didn’t know how to answer it. He didn't know which hat was his.还是应该用：He didn't know which _____her before,he didn`t know she was his aunt.