他坚定地声称自己没有参与那起事件。

He firmly ___asserted that he was not involved in the incident.

她在演讲中明确地表明了自己的立场。

She clearly ___asserted her position during the speech.

这位年轻老师在第一天就通过清晰的规则有力地树立了自己的权威。

The young teacher firmly ___asserted her authority on the first day by setting clear rules.