It was foolish of you to take a taxi ______you could walk there in five minutes.

----I was riding along the street and all of a sudden, a car cut in and knocked me down.------You can never be _____careful in the street.

—Can you lend me some money?—I’m short of money myself, but _____, I’ll give you some . 

—You don’t see the professor from Singapore quite often, do you? —No, we only meet ______．

Mr.Brown ___ goes to bed before midnight.