Understanding time 0 Since the earliest times, civilizations have understood the (0) importance of time. IMPORTANT
12 If you want to plan your future, or simply know how long things take to do, then the precise (12) of time is a necessity.
MEASURE
13 That's why ancient cultures put such a lot of effort into the development of (13)___ calendars and clocks.
RELY
14 At first, people used the (14) of movements in the night sky as a way of predicting annual events.
OBSERVE
15 The Ancient Egyptians realised that it would be (15) to divide days up into smaller units of time.
USE
16 They were responsible for the (16) of the system of twenty-four hours in a day that we still use today.
INVENT
17 The first clocks were sundials using the (17) of the Sun's shadow to mark the passing of the day.
LONG
18 This worked well in sunny countries but was (18) for places where the sky was often cloudy.
APPROPRIATE
19 People living there had to wait for the development of the mechanical clock before they could tell the time with any degree of (19).
ACCURATE
