A : Do you think Professor Smith cancel our class on account of the special conference?
B: Not likely.
A: How do you know?
B: He's never canceled any class as far as I know.
A: He is very conscientious in his work.
B: So hurry up, or we will be late.
on account of：因为，由于
e.g. The meeting was postponed on account of the chairman's illness.
e.g. On account of his extravagance he was plunged into heavy debt.
e.g. The workers of the factory have been laid off on account of the depression.
e.g. The gate was bolted on the inside on account of these dear children.
1. conscientious in：在……认真负责，在……谨慎小心
e.g. She is very conscientious in treating her patients.
e.g. He was a narrow-minded man, painfully conscientious in his statements lest he should be unjust to somebody.
2. as far as I know：据我所知……
e.g. As far as I know,he'll be away for three months.
e.g. As far as I know, the money hasn't been credited to our account yet.
3. hurry up：赶快
e.g. Hurry up, or we'll be too late to get anything to eat.
e.g. "Very well," assented Bosinney."But we'll hurry up, if you don't mind, I have go get back in time to take June to the theatre."