短文填空。 easily, exchange, fast, improve, interest, however, instead, organize, receive, use Sending a nd 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 __  this form (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.