There are six floors ______our school building. Our class is ______ the third floor.
None of the children watch it_________ .
Shanghai is larger than________ city in Gansu.
一What are you going to do this weekend? 一Well,we’ll clean up the city parks _______ it rains .
---You’ve chatted for nearly two hours. ---Yeah. We're talking about the things_________ happened yesterday.
We should read more good books because they can ______our eyes.