Passive voice practice

By mecorbo@hotmail.com

  • Fleming discovers penicillin.

  • Bell Labs inaugurates Mobile Telephone Service, one of the earliest standards for mobile communication.

  • Salk announces the polio vaccine.

  • The Russians launch Sputnik 1

  • A Boeing 707 flies for the first time.

  • The Americans launch Explorer 1

  • PanAm schedules the first Boeing 707 commercial flight.

  • The Russians christen the K-19 submarine.

  • The Russians raise the naval flag on the K-19 submarine.

  • Bell Labs inaugurates the IMTS (Improved Mobile Telephone Service).