Over and over again he rehearsed it in wearisome <em><u>repetition</u></em><em><u> </u></em>until it had assumed a certain and almost invariable form.
Hence the answer is :
<h3>(c) Repetition </h3>
Maya observed the sky and calendars to predict solar and lunar eclipses, the cycles of the planet Venus, and the movements of the constellations.
Robert Hooke as an insult because he was short
