阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。
Hiking tours are a kind of adventure (冒险) tourism. Generally speaking, these vacations focus almost entirely 【小题1】 hiking from one place to another. Hiking tours can be regarded as a group activity or alone.
There are many different ways of organizing hiking tours. Some people like to go out into the areas where there are very few people and travel over long 【小题2】 (distant) from one place to another. They usually stay in hotels overnight before 【小题3】 (travel) to the next place on the following day.
Guides can make hiking trips 【小题4】 (safe) and more focused. Some hikers prefer to take hiking tours without guides because of costs or because they want to challenge 【小题5】 (they). However, employing a reliable guide during a hiking tour 【小题6】 (consider) as a better choice for less experienced hikers.
The activity can be very tiring, and those 【小题7】 are new to hiking may worry that they aren’t 【小题8】 (physical) able to finish the tours. Sometimes it can be helpful for people【小题9】 (go) to the doctor and make sure 【小题10】 is safe for them to choose a difficult hike. Sometimes, a challenging hike can be deadly for someone having heart disease.