1. useful
2. headphones
3. wireless
4. installed
5. downloaded
6. turned
7. enter
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Answers & Comments
1. useful
2. headphones
3. wireless
4. installed
5. downloaded
6. turned
7. enter
B: 1. b), 2. c), 3. b), 4. c), 5. b) 6. b), 7. c).