【正确答案】ready to use

【答案解析】原文：Safety in our workplace is extremely important. Today, I’m going to talk about how to keep a workplace safe. First of all, you must develop a plan to keep your workplace safe. You should tell all your employees what you’ll do to ensure their safety. Secondly, you should regularly check all equipment and tools to make sure that they are well maintained and ready to use. For example, your employees know what to do if there is a fire. Thirdly, you should provide training to all of your employees. Proper training is necessary for them. It’ll reduce accidents and injuries especially when there is a risk for potential injury associated with the job. In addition, you need to keep an open dialogue with your employees. Meet regularly with them to discuss safety issues. Encourage them to share their ideas and thoughts about how to improve safety in the workplace.本题询问为什么要定期检查所有的设备和工具。讲话者第二点提到应该定期检查所有设备和工具来确保其得到良好的维护，即时可用。对比题干和听力中的信息，可以确定空格处填入ready to use，意为“即时可用”。