题目内容：

语法填空 阅读下面材料，在空白处填入一个适当的内容或括号内单词的正确形式。

  Many people prefer airplanes when   1.   (take) a long trip. For others, cruise ships offer the best choice. However, for some travelers, the only way to2.  (true) experience a country is traveling overland by motorcycle, train 3.   hitchhiking (免费搭便车)。

Kevin and Julia Sanders are two well-known overland travelers. In 35 days they rode by motorcycle from Alaska to the tip of South America,  4.  journey of 20,000 miles across 14 countries. Kevin believes that traveling by bike gives people more   5.   (free) because you never have to worry  6.   bus or train schedules. Instead you can organize your time the way you want.

If you prefer to travel in a little more comfortable, trains are another popular overland choice. The train offers travelers the opportunity  7.   (communicate) with locals.

For the adventurous, hitchhiking can be an exciting way to see a country. Hitchhiking can be quite   8.   (danger) and is not advised in many countries, but when  9.   is safe to do so, travelers love it. Hitchhikers often learn things that cannot  10.   (find) in travel guides.