单项选择题
A.An increase in demand is likely to cause a rise in prices.
B.Increases in demand usually lead price increases.
C.If demand increases；as a result，prices tend to rise.
D.Increases in price are often resulted by increases in demand.
填空题 Every day some people are killed while they are crossing the roads．Most of these people are old people and children．Old people are often killed because they can’t see or（）very well．Children are killed because they are not（）．They forget to look and listen before they（）the roads．A car or a bus can’t stop（）．If a car is going very fast，it will travel many metres（）it stops．Some people don’t always understand this．
单项选择题 What apparently had happened，three years ago，was that Kate（）to a different building.
单项选择题 His writing has improved but there is still （）for improvement.