1. A) FALSE: "There are, however, barriers that prevent the smart home industry from taking off".
B) FALSE: "Another recent development can verify an individual´s identity with a quick glance at the system from a distancce".
3. a) guests b) commands c) features d) close
4. a) has become / most b) had worked / would have been
c) which / promoting d) ... that her voice recognition system was not working at that moment.
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