依次填入下列句子横线处的成语最恰当的一项是（ ）①胡歌坐下来看剧本 时 ，等到他表演，他仔细揣摩人物心理、台词，完美演绎了“梅长苏”这个角色。②卢嘉川不说话了，他好像陷入沉思的状态中，正襟危坐， ，苦苦地思索着什么，回忆着过去发生的一切。③那时候，知识的总量还没那么大，如果你 几十年，就可把所学的那个专业的门类全部拿下。

Hearing loss in a large number of teenagers______caused because of their listening to loud music

How does he get to work —He a bike.—How long does it him to get from home to the office—It him 20 minutes.

I have had such a case_________a boy whispered to his classmate now and then while I was having lessons.

Mary is such a lovely girl_____ many ofher classmates are willing to help whenever necessary