根据短文内容，从方框内选择合适的单词并用其适当形式填空，使短文完整、连贯。

easily, exchange, fast, improve, interest, however, instead, organize, receive, use

Sending and  reading  e-mail have  become one of the most  popular daily activities around the  world,
either for business or for pleasure.   Now,    more and  more  teachers and students  are   1  thisform
(形式) of communication to  2   their  language  skills,    particularly in English.   E-mail has become  so
popular because it's quite  3   . In the past,  teachers often  4   pen pal  projects  so that their students
could  5   ideas with their pen  pals.    But  sending  and  6   paper  letters  could  take  a  few  weeks
sometimes, so students might lose  7   in the project some day.
Now with e-mail, __8__ ,  messages can be sent or received   9  on  the Internet.  10   of  waiting
for days or weeks, students can receive a reply during days, hours, or even minutes.

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