1.【原句再现】 This painting is so valuable that it is difficult to calculate what its price would be … (P 34)
【知识要点】calculate的用法
【诊断练习】根据汉语提示完成下列句子（每空词数不限）。
①他们已经计算了旅行费用。
They __________the cost of the trip.
②我们预计将有100人参加会议。
We _________ a hundred people attending the meeting.
