根据短文内容，用方框中所给单词的适当形式填空。每词限用一次。
People send letters on horses in the old days. And now people have many ways to send letters. Sending an e-mail is very 81 from sending a paper letter. An e-mail doesn’t need any paper or envelopes. We can “ write” by tapping (击打) the keyboard on the computer. Sending an e-mail is 82 very quick. It takes only a few minutes to 83 to any place in the world. You can send a letter, a picture or 84 videos by e-mail. But you can never send a paper letter or a postcard by it. People all over the world can easily make 85 with each other by e-mail.
