—What colour of the following represents “purity”?—______.
—Did you see who the driver was?—No, the car ran so fast ____ I couldn’t have a good look at his face.
This pair of sunglasses ____ very expensive.
I want to buy a hat ____ I will look more handsome.
When I went shopping, a beautiful hat ____ my eye.
The ____ are very excited to come to the Great Wall.