There can't be many people who are unaware of e-mail, even if they have never actually sent one. (1)______there are some similarities between e-mail and letters, there are also many differences. The first is that e-mail is delivered instantly, so it can be a very effective means of (2)______when speed is important. This speed means that e-mail is more practical for communicating over large distances. Another difference is that e-mail tends to be relatively informal. People are much more (3)______to use language which they would consider unsuitable for a formal letter. Words spelled incorrectly in an e-mail are less likely to be checked than in a letter. One explanation for this is that (4)______e-mail seems to be less permanent than something written on paper. We can be sure that the future development of e-mail will have all kinds of (5)______effects on the way we communicate. 1. A. Besides B. Since C. Although D. Even 2. A. communication B. transport C. travelling D. entertainment 3. A. possible B. probable C. capable D. likely 4. A. a B. an C. the D. 0 5. A. expected B. unexpected C. expecting D. unexpectedly