• Grammar Present, Past, Future Tenses
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  • While the engineer __________ (test) the new system, the server suddenly __________ (crash).
    was testing, crashed
  • Most users __________ (not realize) that their data __________ (collect) in real time.
    don’t realize, is being collected
  • Developers __________ (work) on this cybersecurity project for months before they finally __________ (launch) it.
    had been working, launched
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