— Mom, my classmates are playing outside. Can I join them? — Not until your homework .
The meat smells _______. Throw it away.
—How long has Dashan stayed in China? —He has ____here for several years.
—____ the afternoon of June 2nd, many foreigners arrived ______ Shanghai.
Please ________ your cigarette. It’s bad for others on the bus.
Which sign means you can’t drop litter?