some roads have lots of rocks on them but people try to (c )them quickly.

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• some roads have lots of rocks on them but people try to (c )them quickly.
• some roads have lots of rocks on them but people try to (c )them quickly.
• there are a lot of amazing things in the world ,and we cannot u____ many of them .for e_____ ,why are some parents b_____very tall while children grow up to be very s_____?why are some animals very c_____while some are not clever at all?why are some people very energetic while some feel t_____easily?we can have many questions l______these ones ,we should try to learn more about this w______ world
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• 已知x2-3xy=-5,xy+y2=3,求x2-2xy+y2.