选择可以替换句中画线部分的最佳

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。1.Look out !A.car is ing. 
A Look carefullyB.Have carefulC.Be carefulD.Look up2.We will have to plant twenty more treesA.more than twentyB.another twentyC.the other twentyD.less than twenty3.They had a good time at the park last SundayA.good luckB.enjoyed themselvesC.had a good weekendD.had a rest4.Grandma is ill . Let’s take her to the hospital right awayA.at firstB.on timeC.from now onD.at once5.Why don’t you e here early ?A.do youB.notC.you notD.not you