Why are more and more people able to work at home? Because of the increasing use of ______. What is the problem with working a

(11)With the increasing use of the Internet, it is becoming more and more common for people work at home. There appears to be many advantages.
    First, it saves time and money normally spent on traveling. (13)It also reduces, pollution. In addition, you have the opportunity to choose when and how you work. It’s not necessary that everyone stick to a nine-to-five working day. (12) You can be you own boss.
    (14)However, there just isn’t enough human interaction if you only work at home. Real communication seems to be absent. Perhaps younger people don’t have this problem, as they can use on-line communication techniques. But employees who work at home seem to spend too much time online trying to find people to meet face to face. (15) In fact, most people are not able to work just at home without meeting their colleagues face to face sometimes.