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Mountain biking (1)(become) an increasingly popular sport, as people become more interested in keeping fit and doing activities which (2)(take) them out of their homes. It is not only a pleasur- able way of improving your fitness, but also one of the most rewarding ways (3)(explore) the country- side. However it is important (4)(follow) a few rules, otherwise you can (5)(harm) the environment and (6)(spoil) other people's enjoyment. Cyclists can (7)(use) any road but they must (8)(pay) attention to the type of path they are on. Some paths (9)(de- sign) for people who (10)(be) on foot, so if you (11)(cycle) along these, you will cause inconve- nience to walkers. On any other path, you should still (12)(respect) walkers. Other things which you (13)(ask) to do are (14)(close) gates behind you, so that farm animals cannot escape and (15)(take) your rubbish home with you.