听短文，写出所缺部分，每空不超过三个单词

    You are now listening to our radio program．In today's program，we are going to talk about Bike to Work Day in the United States．In many cities in America，. of May is the Bike to Work Day．The daypeople to go to work by bike instead of driving a car or taking a bus．Bike riding has become more and more popular now．A report says that the number of people riding bikes to work in the United States has grown bypercent from 2000 to 2013．A research also says thatof bike riding a week can help people to keep fit．It is and it's also good for the environment．Get on your bicycle now．