In the event of an emergency, exit the building ____ you hear the alarm. ____ leaving the building, do not run, and do not use the elevators. Do not collect your belongings ____ heading to the exit—you can get them ____ you are told the building is safe to reenter. Please wait patiently in the waiting area ____ the firefighters tell you to go back in.

WE3. Unit 9C. (Grammar). Workbook. p. 71, exercise C

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