Choose the one option (A, B, C or D) that best completes the passage. A calendar is a way of measuring time to help people organize their activities. Calendars divide time (26) _________ fixed periods, (27) _________ as days, weeks, months, and years. Long a go, when people (28) _________ to farm, they need an accurate way to measure time and the (29) _________seasons. They used calendars. Calendars helped them establish the (30) _________ time to till the soil and plant crops. Caledars told them (31) _________ the harvest should begin. The time periods (32) _________ in calendars are based on movements of the Earth, Moon, and Sun. But a year (33) _________ not divide evenly into months or days. So people (34) _________ adujsted their calendars so that certain events, such as a harvest or important holiday, alwvays (35) ________

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