题目内容
阅读下列短文，回答文后题目。
In the past all letters were sent by train or ship. Now most letters 1 go by ship or train, but some are sent by air. You send a letter 2 so that your friend may receive it sooner. A letter 3 about twelve days to go from England to India by train or by ship. A letter can get to India by air 4 five days now, but 5 the time may be made shorter.
6 people were afraid to send letters by air. They thought that the plane might fall and their friends might not receive the letter. So they sent two letters－one letter by air and 7 by train or ship. They wanted to 8 that the letters would be received. Planes are now almost as safe 9 trains or ships. 10 letters are sent by air.
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