填空题:根据下面资料，回答11-20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 41 (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 42 (person) experience.
E-mail makes it easy to work at home,which is where I now spend most weekends and evenings. My 43 (work) hours aren' t necessarily much 44 (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 45 .(practice) tool.
The Internet also makes it easy to share 46 . (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 about it. If you call each one,you may tire of 47 (tell) the story.
With E-mail, you just write one note about your experience, at your 48 (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 49 (avail) and you can read what they have to say when you have time. E-mail is also an 50 (expense) way to stay in close touch with people who live far away.
第（43）题选