--___________do you clean the goldfish’s tank?
--Three times a week.
| A．How long | B．How often |
| C．How far | D．How soon |
He failed the exam, ______ he tried his best.
A. because B. though C. So
The apple on the table __________ . Throw it away.
A. smell terrible B. smells good C. smells terrible
The more careful you are, themistakes you’ll make.
A. more B. few C. fewer
—How much is the computer?
—About three yuan.
A. thousand B. thousands of C. thousands
—do you go to a movie?
— Once a week.
A. How often B. How long C. How soon