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.In these places,animals or other f__________ (4) of transport have to be used.It is difficult to w__________ (5) 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__________ (6) them on sleds(雪橇).Riding a snowmobile(雪地摩托) is a more m__________ (7),but expensive way of getting around on snow.In desert(沙漠) like the Sahara in North Africa,people s__________ (8) get around on camels.Camels survive w__________ (9) in the desert,not because they can s__________ (10) water in their bodies though!They can survive without water for two weeks and without f__________ (11) for up to a month.H__________ (12) can only go without water for about three to five days.