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__________ 【小题1】by car or by bike. They also get from place to place using p__________ 【小题2】transport such as buses and trains. However, some people live in parts of the world where it is i__________ 【小题3】to build roads.
It is difficult to w__________【小题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__________ 【小题5】them on sleds(雪橇). Riding a snowmobile(雪地摩托) is a more m__________ 【小题6】, but expensive way of getting around on snow.
In desert(沙漠) like the Sahara in North Africa, people s__________【小题7】get around on camels. Camels survive w__________ 【小题8】in the desert, not because they can s__________ 【小题9】water in their bodies though! They can survive without water for two weeks and without f__________【小题10】for up to a month. H__________ 【小题11】 can only go without water for about three to five days.
