Part 1.
1. invention 2. communication - entertainmet 3. listening - reading
Part 2.
1. A 2. C 3. C 4. A 5. D 6. A 7. B 8. C 9. B 10. C
Part 3.
1. haven't you 2. did they 3. doesn't he
TEST 9
Part 1.
1. on - of 2. to 3. at 4. in 5. by
Part 2.
1. difficult 2. advertisement 3. communication 4. qualified 5. Interactive 6. limitation 7. commercial
Part 3.
1. to find => finding 2. doesn't => does 3. to open => opening
