Explanation:

- Original Sentence: We must remember that what we teach our children is what we inculcate in them.

- Option 1: Endanger

- Meaning: To put in danger or at risk.

- Not applicable since the sentence focuses on imparting values, not risking anything.

- Option 2: Inspire

- Meaning: To fill someone with the urge or ability to do or feel something.

- Although inspiring is related to teaching, it doesn't align with the meaning of inculcate, which is more about instilling.

- Option 3: Instil

- Meaning: To gradually establish something in a person's mind.

- This is the correct substitute for "inculcate," as both mean embedding values or habits.

- Option 4: Import

- Meaning: Bring goods or services into a country from abroad.

- Not relevant here, as it doesn't relate to teaching or values.