Open Cloze (text) — Practice

The bicycle is one of the most popular forms of transport in the world, (1) it is cheap and good for the environment. The first bicycle (2) invented in the early 19th century. (3) that time, it did not have pedals. Today, there are (4) than one billion bicycles in the world. (5) people also use cycling as a form of exercise. Some cities have built special lanes (6) cyclists can ride safely.