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A. Fill in the blank spaces to complete what you have learned about the lesson. I have learned that one of the earliest tools that human beings invented was the (1) The basic unit of length for metric is the (2) Approximately one (1) inch is about (3) cm. The metric unit used for determining the mass/weight is the (5) (4). The of an object is the amount of matter it contains. The (6)_ on the other hand, is the pull of gravity on the object. The mass of the paper clip is about_(7)_g. The metric unit used for determining the volume (8) Our water consumptions are measured in (9) (10)_ is measured by the rotation of the earth on its axis. A (11). is used to determine the measure of an angle in degrees. Temperature commonly used units are (12) for the Metric system and '13) for the English system, the base SI unit for temperature is the (14) . А (15)_ is a ratio of two measurements having different units of measurements. ​