I. Fill each of the numbered blanks in the following passage.
The tourist (1) _______________ is considered to be the World's largest industry. Before 1950, about one million people (2) ______________ abroad each year (3) _______________ by the 1990s, the figure had (4) ________________ to over 400 million every (5) ______________
(6) _______________ large numbers of tourist, however, are beginning to (7) ______________ problems. For example, in the Alps the skiers are destroying the mountains (8) _______________ came to enjoy. Even parts of Mount Everest in the Himalayas are reported to be covered (9) ________________ old tins, tents and food that have been (10) ________________ away.
But at time when we have greater freedom to travel (11) ________________ ever before, more and more people are asking how they can enjoy their holiday (12) _______________ causing problems by spoiling the countryside.
Now there (13) _________________ a new holiday guide called Holidays That Don't Cost the Earth. It (14) ________________ you how you can help the tourists industry by asking your travel agent or your tour operator the right questions (15) ________________ you go on holiday.
