Saying why bike-sharing is the best form of transportation
Make a wh- question: Cities are usually full of people and traffic.
Which are some common problems for cities?
Make a wh-question: In the future, bike sharing may be an answer to many cities' traffic problems.
Which can be a solution for cities with traffic problems?
Make a wh-question: In a bike-share system, people pay to use a bike for a short time.
How does bike-sharing system work?