What is a sentence for tenacity?

Her ability to succeed was due mainly to her unwavering tenacity.

'Stick-to-it-iveness' is a colloquialism that means 'tenacity'.The cat that is hanging onto the clothesline for dear life will have to rely on his tenacity.

The student was not able to answer this question but, with great tenacity, asked for an answer on the Internet.

"The way you were boxing then, with such tenacity and strength, it made me weep for more!"

I have a tenancy to speak without thinking first