The air_______ of Shenzhen in February ranked the 10th among 74major cities in China. A. quarter B. quality C. quantity
The 16-year-old _____ often shares her _____ and sadness with her best friend.
--What’s in the bag? --_____________.
向别人介绍自己的兄弟时应说:.
—Where is Liu Xiang from? --He is from .
—Are there boats on the lake? --Yes, there are .