significant - important, meaningful, development - growth, progress, benefit - advantage, impact - effect, influence, instant messaging - sending messages immediately online, up-to-date - modern, current, considerably - a lot, unacceptable - not allowed or not good enough, strained / extra strain - extra pressure or stress, efficiently - working quickly without waste, distraction-free - without things that take your attention away, frustrated - annoyed or upset because you cannot do something, astonished  - very surprised about something ,

ExamBoosterB2. Student life and technology Part 5.1 (reading)

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