综合填空根据短文内容，选择方框内的单词,并用其适当的形式填入空白处，使短文意思通顺连贯、语法正确。

cheap,    increase,    price,       more,     time

There have been many changes in the ways of transport in Beijing in recent years. From 1996 to 2000, the number of bicycles has        by 40%, for it is convenient and a good form of exercise to ride a bicycle. Over 18,000     taxis have appeared in 2000. More and more people like to take a taxi as they can save a lot of time and the       is reasonable. The number of private (私人的) cars is 51,000. It’s three       as much as that in 1996. We can see people are getting rich and can afford to buy cars. The number of buses doesn’t change much. Though it is        to take a bus, they are slow, dirty and crowded. Something should be done to improve the situation of buses.