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Before you join the company, you will have to have a ________(medical; medicine)examination．

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There was a grin ________(in; on)his face．

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We can change the electricity into forms of energy ________(that; what)we can see, hear or feel．

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Nobody's ever seen electricity．It's ________(invisible; visible)．

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A meter measure the amount you use, and you get a bill for it ________(monthly; month)．

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Tom thinks we can buy the electricity ________(in; with)packets, like sweets!

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History books are ________(fiction; non-fiction)ones．

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You must switch ________(on; off)the electricity before changing．

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The cables are connected to a ________(reservoir; shop)．

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Electricity ________(comes; flows)through a wire．