老师向学生们展示了如何解这道数学题。

The teacher ___showed the students ___how ___to solve the math problem.

有人告诉过你在紧急情况下该做什么吗？

Has anyone ___shown you ___what ___to ___do in case of an emergency?

技术人员向我展示了如何调整设置。

The technician ___showed me ___how ___to adjust the settings.