Occur,

*  It never occured to me that today was not a school day

*When did the accident occur?

Assume,

*My mother told me not to assume bad thing about my grades.

*He assumed the style of an aggressive go-getter.

Process (verb & noun),

*The army processes all personnel entering or leaving the service

* The making of chesse takes process.

and Respond.

*The teacher asked a questions and I responded.

* My Response was correcrt.