1,是be based on
2.on earth究竟
on the earth在地球上
3 我们要看回原句是怎样,实际用哪个介词,例如
This is the house in which he was born
This is the weapon with which he used to attack the guy
4.take up 拿起,开始从事的意思
Shall we take up the business now
现在我们来谈谈生意,好吗?
go in for 参加,从事；追求；赞成
What kind of recreation do you go in for ?
你在文娱方面有什么爱好?
devote 致力于,通常词组为devote oneself to sth

5.break down分解；发生故障；失败；毁掉；制服
break out 爆发 ,突发
break into 闯入,破门而入