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The tourist industry is (1)............... to be the largest industry. Before 1950 one million people traveled abroad each year but by the 1900s the figure (2)............... to 400 million every year.
(3)............... large numbers of tourists, however, are beginning to cause problems. For example, in the Alps the skiers are destroying the mountains they came to enjoy. Even parts of Mount Everest in the Himalayas are reported to be covered (4)............... old tins, tents, and food that have been (5)................
But at a time when we have (6)............... freedom to travel than ever before, more and more people are asking how they can enjoy their holidays (7)............... causing problems by spoiling the countryside. Now there is a new holiday (8)............... called "Holidays That Don't Cost The Earth". It tells you (9)............... you can help the tourist industry by asking your travel agent the right questions (10)............... you go on holiday.