第二节 语法填空 （共10小题；每小题1.5分，满分15分）
阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卡标号为31－40的相应位置上。
Now people are choosing to travel by train again. Gas is expensive, and driving is 31 （tire）. When you go 32 air, you have to drive out of town to an airport and wait a long time for your plane. But trains go from one city center to another.
American trains are very modern and 33 （comfort）. Some have restaurants and bars, and 34 （usual）go through beautiful parts of the country sometimes have glass 46 （roof）. You can look around and enjoy the wonderful forests and mountains. have bedrooms. Trains which 35
But there are problems 37 . Many trains are old. They break down or arrive late. Stations are not always clean and friendly places.
It’s 38 （bad）. same all over the world. 39 you pay to go on the best trains, you get the best. If you travel cheaply, you must expect the 40
