dealing|dealings

老师正在处理教室里的纪律问题。

The teacher is ___dealing with the discipline issues in the classroom.

我们公司与其他企业的业务往来一直很顺利。

Our company's ___dealings with other businesses have always been smooth.

他与供应商的不正当往来最终导致公司损失惨重。

His improper ___dealings with suppliers eventually caused huge losses to the company.