题目内容：

先通读下面的短文，然后根据短文内容和所给首字母，在空格内填入一个适当的词，使短文意思完整。

In many countries, people t__________ 1.by car or by bike. They also get from place to place using p__________ 2.transport such as buses and trains. However, some people live in parts of the world where it is i__________ 3.to build roads.

It is difficult to w__________4.in snow but easy to ski over it. So in places like Alaska, people use skis. If they want to go faster, they get dogs to p__________ 5.them on sleds(雪橇). Riding a snowmobile(雪地摩托) is a more m__________ 6., but expensive way of getting around on snow.

In desert(沙漠) like the Sahara in North Africa, people s__________7.get around on camels. Camels survive w__________ 8.in the desert, not because they can s__________ 9.water in their bodies though! They can survive without water for two weeks and without f__________10.for up to a month. H__________ 11. can only go without water for about three to five days.