Time If you can【T1】______, you can know the time of day. But no one knows【T2】______.【T3】______our success in measuring the smallest parts of time, time remains one of the great【T4】______of the universe. One way to think about time is to【T5】______. There could be【T6】______, because time and movement cannot【T7】______. A world without time could exist only【T8】______there were no changes, for【T9】______. We know that【T10】______when something changes.