43
(A)Because
(B)If
(C)While
(D)Though

The history of electronic mailing goes all the way back to 1969 when a professor at UCLA sent the first message via computer to a colleague at Stanford. The computer which sent the first message actually crashed right after the message was sent, but the message did reach its (39) at Stanford. E-mail was born. Today, e-mail (40) communication. In 2002, the Internet provider AOL alone reported handling over 42 million e-mails each day. When the number of e-mails worldwide is (41) to the number of pieces of mail sent each day, you will find that e-mail usage is more than seven times higher than “snail mail” usage. It is not hard to imagine why this is the case since the cost of sending postcards and letters is much higher, (42) the fact that e-mail is more convenient than having to visit your mailbox or local post office. E-mail messages also beat postal delivery time hands down. (43) an international letter might take a week or more for delivery, an e-mail can be sent and responded to the same day.

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