1.roar with laughter 哄堂大笑

例句：
He threw back his head and roared with laughter.
他仰著头哈哈大笑.

2.take advantage of 利用

例句：
It never occurred to me to take advantage of him.
我决没有想到过要占他的便宜。

3.serve on vt. 担当(担任)

例句：
He is an interested party and can not serve on the jury.
他是与案件有关的当事人，不能做陪审团的成员。

4.see to v.负责, 注意

例句：
I will see to the sick classmate.
我会照顾那个生病的同学。