我们正在进行一项调查，以了解顾客对当地公交服务的看法。

We are ___conducting a survey to find out what our customers think of their local bus service.

这些实验是由纽约的科学家们进行的。

The experiments were ___conducted by scientists in New York.

这项研究是通过在线问卷进行的。

The research was ___conducted through online questionnaires.