指出下列句中划线部分的词性Sound travels at 1,000 feet per second.
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指出下列句中划线部分的词性Father booked three seats on a plane.
指出下列句中划线部分的词性The injured driver can hardly stand the pain any longer.
指出下列句中划线部分的词性To construct a reservior is an important government project.
指出下列句中划线部分的词性We learn from the past, experience the present, and hope for success in the future.