After three years of study there, he received ________.

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When he was a young boy, Einstein ________ lots of questions.

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By the time he ________ forty-three years old, Einstein ________ the Nobel Prize for Physics.

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The big tree ________ across the road should be cleared away soon.

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Looking out of the window, I saw my mother ________ back from work.

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Some of the trees are cut for firewood and ________ left to grow even taller.

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The man is ________ in collecting match boxes, but other people don't think it ________.

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The question is ________ do to bring peace to the world.

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Allan doesn't write to me so often as he ________.

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—Let's meet at the gate of school, ________ ?

—OK.

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