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______ we first heard of the man referred to as a computer specialist in softwar
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We have an adviser on hand in this activity ______ you have any worries or probl
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What will you do if ______ outside with no key?A．being lockedB．having lockedC．lo
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Your thanks should go to ________has offered you help.A．whoB．whomeverC．whoeverD．
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Following the guide, we went into a house; ________ wall hung a picture of Einst
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In front of the famous big trees ________ a family, ________ the parents treat t
