O-3:on account of 因为
A:Do you think Professor Smith cancel our class on account of the special conference?
A:你认为史密斯教授会因为那次特别会议而取消我们的课吗?
B:Not likely.
B:我想不可能。
A:How do you know?
A:你怎么知道?
B:He's never canceled any class as far as I know.
B:据我所知,他从未取消过任何课。
A:He is very conscientious in his work.
A:他对工作认真负责。
B:So hurry up, or we will be late.
B:所以嘛,快点走吧,再不然就迟到了。
A:OK.
A:好吧。