Before ... (centrifuge) the tubes, I (balance) the machine load., Before ... (discard) the chemical waste, I (wear) the heavy-duty gloves., Before ... (input) the test results, I (double-check) the patient's registration number., Before ... (print) the final reports, I (verify) the doctor's signature., Before ... (open) the new reagent kit, I (register) the lot number., Before ... (incubate) the petri dishes, I (set) the temperature to 37°C., Before ... (clean) the microscope lenses, I (apply) the proper optical solution.

Lesson 2

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