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.

zero conditional

打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？