If he ____ the machine incorrectly, the machine does not respond. if you don't do maintenance to yours machines, the machines ____ work well. When you repair a machine, you ____ to test it again. If you don't choose the right tool, ____ damage the machine parts. When she ____ use safety glasses, she can't work. ____ the screws, the machine is secure. If you lubricate the gears, the ____. when you ____ the right screwdriver, you can tighten the screw.

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