Electric bicycles run on battery-operated(用电池发动的) motors. More and more people like this type of bikes______their speed and quality.

They were______made in 1980s in China, but the selling was not very good. Today, thanks to(多亏了) improvement(改进) on the quality of the batteries, the electric bikes sell _____. There are more than 100 electric bicycle producers in China and____of such bicycles have been produced. Japan is________large producer of such bicycles in the world.

Now China is one of the______producers of electric bicycles in the world, and lots of people have_______this kind of bicycles.

Such bikes are quick, safe and________to operate,____their batteries still have shortcomings(缺点). They weigh more than 10 kilograms. Their service life is less than two years and they____500 yuan each.