—Why are you standing there,Kangkang?—I can’t see the blackboard clearly.Two tall boys are sitting me.
Let’s _________ what we can do to save the animals in danger.
--- How can you _________ there? --- ___________air.
One of the most famous places of interest in China _________ the Palace Museum.
---__________ does it take to finish your homework? --- For an hour.
He sometimes ___________ a train to work.