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who / which

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  • It's a device _____ opens windows
    which
  • A pacemaker is a device ______ helps people with heart problems
    which
  • Paul is someone ______ loves to help
    who
  • I want to talk to someone _____ has travelled to China
    who
  • An alarm is a tool ___ helps you in the morning
    which
  • a lab technician is a ________ who works in a lab
    person
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