The thermostat (恒温器) ________ the fact that different metals have different coefficients (系数) of expansion.

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________, allow me to express our warm welcome to our distinguished guests.

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She ________ when she saw the pile of work.

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He was ________ known as the “Iron Man”.

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The winters are usually mild．In the mountains, ________, the winters are cold.

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The mechanics had to ________ the engine, and fix it, and put it together again.

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How beautifully she sings! I have never heard ________.

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Greenland, ________ island in the word, covers over two million square kilometres.

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In that case, there is nothing you can do ________ than wait.

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Candles can ________ light.

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