When she came in, she found a stronger ________ at the back of the classroom with his eyes _______ upon her.
When they met again in New York, ten years __________.
__________ the time the firemen arrived, the building had been burnt to pieces.
__________ industry develops quickly, more and more rivers are being polluted.
Most Chinese musical instruments are quite different __________ western ones __________ shape.
His parents are both out of work, so they can't __________ a computer.