My mother is a writer.She________more than ten books since 1988.
It’s bad for your eyes _____computer games too much.
This backpack is not expensive. And the price of it is the ____of the three.
The weather in Guiyang in summer is ___than that in DuYun.. They are different.
_________ it is snowing, _________ they are still working.
---_______does your mother watch the talk show?---Once a week.