--________ How long haven’t you cleaned your room?--Two months at least--No wonder(难怪)it’s so untidy.
The reporter said that the UFO ________ from north to south when he saw it.
Hurry up, everyone ________ for you.
Trees __________ on Tree Planting Day only.
Sorry, smoking ________ here.
Some rules _________ to stop people from polluting the environment.