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Fill in the blanks1. A _______ clock cannot be used at night 2.electric current flow throw a circuit only when it is ______3.A current carrying wire devalop _______ filed around it4.many light rays form ______ of light 5. amount of water on the earth maintaining by ________6._______ of water makes it unfit for consupmtion 8.the time taken by pendulum to complete one oscillation is known as its _________9. the smallest blood vessels that arteries and vains are called _______​

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