Bicycles are very popular today in many countries. Many people use bicycles for exercises because bicycles are not too expensive, while the other activities usually cost a lot of money. They do not need gas to make them go. They are also easy and cheap to fix. In cities, many people like bicycles better than cars. With bicycles, they never have to wait in traffic. They also do not have to find a place to park. And finally, bicycles do not cause any pollution! Let us use bicycles to reduce the problem to our city.
According to the passage, bicycles are popular for excercise because of many reasons except _________ .
they are not too expensive to buy
they do not need gas to make them go
they are easy and cheap to fix
they can be used in a park