第二节：短文改错(共10小题；每小题1.5分，满分15分)
注意：原行没有错的不要改。
A helicopter is sometime more useful than a big plane. When 11＿＿＿＿＿＿
it takes off, it goes straight on. When it lands, it comes 12____________
straight down. It needs not only a small place for both taking 13 ___________
off and landing. When a tall building is on fire, we can 14____________
see a helicopter to come down to rescue the people on the top 15 ___________
of them. Helicopters make many kinds of work easy. They are 16____________
used to making maps, flying over the ground and taking pictures 17____________
from the air. To rescue people whom are very 18____________
sick or in danger, helicopters are send to some faraway 19____________
areas. The helicopter takes place of a car or a train 20____________
in some areas.