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School is over. Let's go home t________.

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He is a computer fan. Look! He is w________ on the computer.

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After fifty years, railways c________ most countries.

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The first passenger train was c________ the Rocket.

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In 1804,a locomotive c_______ about 70 passengers a short distance on some iron r_______.

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In the 1700s,many i________ were working on the steam engine.

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Who i________ the steam engine?

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I w________ tell them my theory.

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He puts his hand on the cardboard and turns the jar u________ down.

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M________ you should do this experiment outside.