The students hurried to the classroom ________ the bell rang.
| A．until | B．as soon as |
| C．if | D．so that |
My grandfatherus stories when I was young.
| A．was used to tell | B．is used to telling |
| C．used to tell | D．used to telling |
—Why is the classroom so dirty?
—Sorry，sir. Ityesterday, We forgot to do it.
| A．doesn’t clean | B．didn’t clean |
| C．isn’t cleaned | D．wasn’t cleaned |
Sixteen-year-oldsto drive.
| A．is allowed | B．are not allowed |
| C．allowed | D．is not allowed |
— do you study for tests?
—I studylistening to tapes.
A. How; with B. What; with
C:.How; byD. What; by
Don’t forget ______ the door when you leave.
| A．close | B．closed | C．to close | D．closing |