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20. Driving a car can be expensive. The bicycle, on the other hand, is a cheap form of (16)______ becauseit doesn’t need any fuel. In fact, it costs practically nothing after you’ve bought it. It also helps keep you fitbecause you get exercise when you ride it. Another good thing (17)______ a bicycle is that it doesn’tpollute the air. If everyone rode bicycles instead of driving cars, we wouldn’t be using up the world’s oil soquickly. While the bicycle has these advantages, it has some disadvantages too. It is convenient only forrelatively short journeys, (18)______ you can travel quite a long way in comfort in a car. Another problemis that the cyclist is not protected from the weather and gets wet when it rains. Cycling isn’t very nice inheavy traffic (19)______. The best place for a bike ride is a quiet country lane. Main roads and city streetsare often so busy that it needs some courage to (20)______ a bike on them.