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 day____people 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 by____percent from 2000 to 2013．A research also says that____of 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．