No ________ here! Haven’t you seen the sign?
A. smoking B. to smoke C. smokes
Have you ever read books ______ by Lu Xun?
| A．writing | B．written | C．are written | D．writes |
—It’s too late. I have to go now.
—Oh, it’s raining outside. Don’t leave ______ it stops.
| A．since | B．until | C．while | D．when |
—Thank you for the nice birthday present.
—______ .
| A．Don’t say so. | B．You’re welcome |
| C．Thanks a lot | D．No problem |
There are ______ floors in the building and my home is on the ______ floor.
| A．twenty; fifteenth | B．twenty; fifteen |
| C．twentieth; fifteen | D．twentieth; fifteenth |
— Do you know anything about Chinese knots (中国结)?
— Yes. They are usually regarded ______symbols of good luck.
| A．for | B．by | C．with | D．as |