Teacher said, “The earth_round the sun.”

The question is asking what verb should be used to fill in the blank in the sentence "Teacher said, 'The earth _______ around the sun'". The verb that correctly completes the sentence is "moves" because the movement of the earth around the sun is a continuous action that is happening right now. The other options presented - "moved", "has moved" and "will be moving" - are not the correct choice because they do not accurately reflect the ongoing action of the earth's movement around the sun. So, the correct answer is "moves".