Scientists ____ fiber optic technology many years ago. ____ how a fiber optic cable transmits light?Did you ever see The technician ____ any issues with the cables yesterday.____ My company ____ using fiber cable networks. They ____ new fiber optic cables under the streets two months ago. She ____ with fiber optic cables before. The technician ____ an hour ago to check the connection. The signal ____ much stronger since the upgrade.

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