Americans travel by air in 1 the same way as Europeans and 2 travel by train. There are, in fact, not many railroad stations 3 in the USA, 4 the track 足迹，轨道，跟踪 is still being used, since most of America's freight 货运，运输 is still carried 5. As for passengers, there is a vast network 网状织物，网状系统 of airlines and airports in easy 6 of almost every American town. Airports, now the travel centers of the USA, 7 comfortable places 8 coffee shops and bars and clean restrooms.
Flying in America is 9 expensive than in many other countries, 10 the government subsidized 补助 air fares. Yet the different airlines are not state-owned and compete 竞争，竞赛 with one another for passengers.
Those who cannot 11 either train or plane take the Grey-hound 猎狗，卑鄙的人，骚扰 bus. 12 transport system 系统，制度 in the world carries so many passengers by night and by day. Drivers are 13 aid and have a wonderful safety record.
Europeans tend 14 their cars. But Americans treat their cars 15 as vehicles which are important 16 their lives — to take them to work, to shopping 购物 places, to picnics or to their friends. 17 when they take a vacation they rarely 稀少地，难得地 drive long distances.
There is 18 form of travel which is widely used in the USA, — the rented car. Every city and town 19 at least one car rented firm 公司, some of them are nationwide and have branches abroad 20.
1.all more as much
2.Japaneses the Japanese the Japan Japans
3.kept remained left remaining
4.for when although because
5.by train on train in train with train
6.reach grasp 抓紧，领会 master range
7.is are have been has been
8.beside by with have
9.most more less least
10.if because of when because
11.offer take reach afford
12.All None No Every
13.more greatly highly wonderfully
14.to love to loving to be loving loving
15.really only actually usually
16.for to with on
17.Except Because Besides /
18.other another the other some other
19.has had have has have had
20.other countries either also as well
1-10 DBCCA ABCCD 11-20 DCCAB BABCD