The students are cleaning their classroom. _____ are cleaning the windows. _____ are cleaning the chairs.

If nobody ____ the traffic rule, the Chinese style of crossing the road ____.

Is the door_____now? It’s so cold.—Sorry,I will keep the door________.

Though to see us, the professor gave us a warm welcome.

How will you help with the activity?— We will ______ leaflets to ask people to take part.