The tourist industry (19) _____ to be the world's largest industry. The direct economic impact of the industry, including accommodation, transportation, entertainment, and attractions, is worth trillions of dollars every year. The statistics show that the number of international tourist arrivals worldwide (20) _____ 1.04 billion in 2012.
Such large numbers of (21) _____, however, are beginning to cause problems. For example, in the Alps, thousands of skiers (22) _____ the mountains they come to enjoy. Even parts of Mount Everest in the Himalayas are reported to be covered with old food tins, tents, and pieces of equipment that have been thrown away.
Now there is a new holiday guide called Holidays That Don't Cost the Earth. It tells you how you can be a responsible tourist by (23) _____ your travel agent or your tour operator the right questions before you (24) _____ a holiday.
Question 19.