填空题

It’s summertime. For many Americans, this is the season to travel. Why Because school is out. Because the weather is great. And most of all, because we all (36) a break.
Americans are used to traveling. Most companies (37) an annual vacation for their employees, and people often use that time to travel. Some people just visit friends or relatives in (38) states. Others go on low-budget weekend (39) and stay in economy motels. Meanwhile, camping out in the great outdoors (40) to adventurous types.
Most Americans prefer to travel within their nation’s borders. Why For one thing, it’s cheaper than traveling abroad, and there’s no language problem. But besides that, the vast American territory offers (41) tourist attractions. Nature lovers can (42) beaches, mountains, canyons, lakes and a wealth of natural wonders. Major cities offer visitors a multitude of urban delights. The (43) of modern freeways, railways and airplanes makes travel in America as easy as pie.
Many American vacations are as unique as the people who, take them. Environmentalists prefer "green vacations." (44) . History buffs seek out famous historical sites and museums. Families often plan their trips with the kids in mind, (45) .
Americans aren’t the only people in the world who travel. International business, mass communication and jet airplanes have created a world of globetrotters. People all over the world enjoy going abroad to travel. (46) .