It’s essential for citizens to know that the haze(雾霾.can do harm ________ people’s health.
I will stay at home and read some books if it _________ tomorrow.
—Who is ________ English teacher? — Well, it’s Mrs. Green. She teaches ________ English very well.
There are more than fifty _________ in our school.
Lucy is ________ university student. She likes playing _______ piano.
This kind of cup _______ of paper.