Do you know who the young man is beside the door? — A man _____ himself Jason. [ ]

下列对加线词的用法，判断准确的一项是① 悦亲戚之情话，乐琴书以消忧 ② 彼于致福者，未数数然也 ③ 徐孺下陈蕃之榻 ④ 而后乃今将图南

How come your father can read books in German? — Well, he____on a project with some German engineers for 3 years when he was young

Many of them turned a deaf ear to his advice, ________ they knew it to be valuable.

Whose book is it— I asked many people, but knew.