填空题

Sending and reading (36)______has quickly become one of the most (37) ______daily activities around the world, either for (38) ______or pleasure. Now, more and more teachers and students are using this form of (39) ______to improve their language skills, particularly English. Several reasons why email has become a great tool are that it is fast, (40) ______, and affordable. One particular activity that takes (41) ______of these points is a keypal (42) ______. In the past, teachers often organized pen friends (43) ______where their students would exchange letters with another group of students in another country. However, (44)___________________, and by that time, students might lose interest in the project or the class might end before a series of meaningful exchanges can take place. Furthermore, (45)____________________. With email, however, messages can be sent at a click of a button at school, home, or an Internet cafe, and if you are using a free email account, the cost is free (not taking into account any Internet Service Provider fees you have to pay). (46)___________________.