Question

complete the sentence with the word that best fits the overall meaning and tone. the tour guide claimed she could not put a price on the ____ masterpieces at the château de versailles. invaluable costly

Explanation:

The word "invaluable" means extremely valuable, so valuable that a price cannot be set. "Costly" just means expensive. Since the tour - guide says she can't put a price on the masterpieces, "invaluable" is more appropriate.

Answer:

invaluable