他在一家知名鞋类制造商工作。

He works for a well-known shoe ___manufacturer.

如果汽车制造商安装有效的过滤器，空气污染可以减少。

Air pollution could be reduced if car ___manufacturers installed effective filters.

该公司是家用电器的主要制造商。

The company is a leading ___manufacturer of household appliances.