综合填空。根据短文内容及首字母提示在空白处填上适当的单词，使短文意思完整。

     Airplanes are the newest kind of transportation. From early times, people tried to f  1   through the sky like

birds. About 100 years a  2  , someone took the first ride on an airplane. This ride lasted for less than one m  3  .

These first planes were very s  4  , too. Only one o  5   two people could fly in them at one time.

     Today these p  6   are very big and fast. H  7   of people can travel in them at one time. W  8   them, people

can get f  9   one side of the United States to the other in less than one day. Traveling is very d 10   from the

way it was 100 years ago.

1.________    2.________    3.________    4.________    5.________

6.________    7.________    8.________    9.________    10.________