Why do We Use E-mail? Personal computers and the Internet give people new choices about how to spend their time. Some ma

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问题     Why do We Use E-mail?
    Personal computers and the Internet give people new choices about how to spend their time.
    Some may use this【C1】______ (free) to share some time with certain friends or family members, but new technology will also let them stay in closer touch with those they care about most. I know this from【C2】______ (person) experience.
    E-mail makes it easy to work at home, which is where I now spend most weekends and evenings. My【C3】______ (work) hours aren’t necessarily much【C4】______ (short) than they once were but I spend fewer of them at the office. This lets me share more time with my young daughter than I might have if she’d been born before electronic mail became such a【C5】______ (practice) tool.
    The Internet also makes it easy to share【C6】______ (think) with a group of friends. Say you do something fun, see a great movie perhaps, and there are four or five friends who might want to hear a-bout it. If you call each one, you may tire of【C7】______ (tell) the story.
    With E-mail, you just write one note about your experience, at your【C8】______ (convenient) ,and address it to all the friends you think might be interested.
    They can read your message when they have time, and read only as much as they want to. They can reply when they are【C9】______ (avail) and you can read what they have to say when you have time. E-mail is also an【C10】______ (expense) way to stay in close touch with people who live far away.
【C5】

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答案practical

解析 本句空白处放在不定冠词a之后及名词tool之前提示可填入形容词来修饰该名词。因此,将提示词名词practice改成形容词practical(实用的)填入即可。
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