By the year 2020 scientists _____ a lot of research on AIDS.
A．had doneB．doC．a(chǎn)re doingD．will have done
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--- Has Li Lei finished his work today?
--- I have no idea, but he ______ it when I saw him this morning.
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Unforgettable ______ her pale blue eyes that flashed like diamonds and thin lips wore a pleasant smile.
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The vegetables we ate for lunch ________ very good. They had been overcooked.
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---Please tell me what really happened.
---Oh, I _________, and I hit a parked car.
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She got up, _______ herself in a hurry and then went downstairs for breakfast.
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--- I think they'll come if they _________ free.
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All the new words ______up in the dictionary yet.
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He is so careless that he always ______his school things at home.
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