Nowadays we can see more and more electric bikes in the street. Electric bikes 1.________(be) easy to ride. They run fast and make no 2.________(pollute). They become very popular, 3.________ the electric bikes also cause more traffic accidents. So China plans 4.________(make) a new rule for the electric bike riders. If an electric bike is 5.________(heavy) than 40 kilos and can go faster than 20 kilometers an hour, its rider must get a license. It means riders have to pass driving tests before they ride 6.________(them) electric bikes on the road.
