Something must be done to prevent our city ____ by thick smoke.
________ with the size of the whole earth,the biggest ocean does not seem big at all.
________,the more expensive the camera,the better its quality.
Faced with a bill for $10,000,________.
________ in a white uniform, he looks more like a cook than a doctor.
________ around the Water Cube, we were then taken to see the Bird's Nest for the 2008 Olympic Games.