disposal

这座城市改进了其垃圾处理系统。

The city has improved its waste ___disposal system.

但周三上午我随时听候您的差遣。

But on Wednesday morning I'm ___at ___your ___disposal.

我不在的时候，把我的笔记本电脑留给她随时使用。

I left my laptop ___at her ___disposal while I was away.