Điền từ còn thiếu vào chỗ trống, hoàn thành câu

There can't be many people (30)
sent one. Besides there are some similarities between e-mail and letters, there are also many differences.
are unaware of e-mail, even if they have never actually
The first is that e-mail is delivered instantly, so it can be a very effective means (31)
communication 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 possible (32)
letter. Words spelled incorrectly in an e-mail are less likely to be checked than in a letter. One explanation
language which they would consider unsuitable for a formal
for this is that an e-mail seems to be less permanent (33)
something written on paper. We can be
sure that the future development of e-mail will have all kinds of expected effects on the way we
(34)
116. A. which
117. A.in
118. A.to using
119. A. a
120. A. communicate
C/ WRITING
1/ write a nassare to d
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B. who
B. on
B. used
B. an
C.when
C. with
D. where
D. of
B. communicative
C. to use
C. the
C. communicating
D. to be used
D. than
D. communication