In order to make students have a good knowledge of science subjects they are encouraged t

问题补充：

In order to make students have a good knowledge of science subjects, they are encouraged to their own science experiments.

A. operate

B. direct

C. manage

D. conduct

答案：

A. operate

B. direct

C. manage

(答案→)D. conduct

解析：conduct意思为 “进行; 实施”；conduct an experiment做实验。operate 操作；开动(机器)等；direct管理；导演；manage 管理；处理；操纵。