We work together to achieve our common purpose: __________ world that is safer, cleaner and healthier than __________ one we are living in.
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I saw ___ eighty-year-old man with ____ umbrella in such a sunny day just now.
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— Sandy, _______ apple on the table is for you. Remember to eat it.—Thanks, I will. _____ apple a day keeps the doctor away.
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–Who is ___ boy in a red cap? --He is Tom. He is good at playing ____ basketball.
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