题目内容：

找错 do you have enough students to carry the boxes?no,i think we need more tweo students.
please wait thre.i will be back in two a half hours.
the accident happened on 2007,february 5th

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do you have enough students to carry the boxes?no,i think we need two more(或者是another two) students.please wait there.i will be back in two half hours.两个半小时是two half hoursthe accident happene...