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?
Make a wh-question: People can use an application on their smartphones to look for bikes and to pay for them.
How can you look for a bike and pay for it?
Make a wh-question: It's convenient because they can get a bike from any bike station in the city.
Why is bike sharing system convenient?
Make a wh-question: There are now almost a million bikes in bike-sharing systems worldwide - 400,000 of them in China alone.
How many bikes are there in bike-sharing systems?
Make a y/n question: Bike sharing is not new.
Is bike sharing new?
Make a y/n question: Biking is a cheap and fun way of exploring the city.
Is biking a cheap and fun way to explore the city?
Make a y/n question: These bike-share systems are very easy to use.
Are bike-share systems easy to use?
