Relier Pairs Talking About FunctionsVersion en ligne Matching par Logos Sprachinstitut 1 The purpose of the backup file is to keep our data safe. 2 The shelf is bolted to the wall with screws. 3 The purpose of the wheel is to steer the truck. 4 The bridge is supported by steel pylons. 5 The vehicle is powered by the engine. 6 The airflow is regulated by the valve. 7 The function of the switch is to turn the machine on and off. Screws bolt the shelf to the wall. The valve regulates the airflow. The switch turns the machine on and off. The backup file keeps our data safe. The wheel steers the truck. Steel pylons support the bridge. The engine powers the vehicle.
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