It proved ________ than we had thought.

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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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That's one of the things which Sam, ________, had a clear idea about.

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Don't you think ________ easy to write something about your family?

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Living in the central Australian desert has its problems, _____ setting water is not the least.

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—Which of the dictionaries do you like most?

—________. They're both expensive and of little use.

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

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—You look tired.

—Yes. I ________ without rest until twelve o'clock.

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My trousers were ________ in the broken chair when I got up.

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