EXERCISE 27 Travelling can be fun and easy.A vacation trip to another country is especially __1_ when the travelling conditions are good.Good travelling conditions __2_ a comfortable mode of transportation,knowledge of the __3_ language,familiarity __4_ the custom and habits of the people in the country,and pleasant travelling __5_.All of us have had nice trips __6_ this. Most of us have aslo had trips that we would __7_ to forget.Many conditions can produce a bad __8_ experience.For example,if the four conditions __9_ above do not exist,we will probably have a bad experience,__10_ at best a difficult __11_.Students who travel to a __12_ country to study often have a difficult trip.They usually travel __13_.They don t know the language of the new country __14_.They often arrive in the new country __15_ a judge international airport.From the airport,they need to __16_ their way to their school.Maybe they need to __17_ airplanes,to take a bus,a train,or a taxi.They need to do all this in a country__18_ everything is unfamiliar.Later,after the experience are __19_,they can laugh.But at the __20_,they feel terrible.