When you take a plane, you_______ obey the rule to turn off your cell phone.
It isn’t warm today, the sun is shinning.
Teenagers like reading the books ________ are written by Guo Jingming.
Kate knew nothing _______ her mother told her.
There are many kinds of pollution around us, _________ air pollution, noise pollution and light pollution..
You may ________the story book for two weeks.