We cannot guarantee the ______ take-off of the flight, since we are having such a foggy day.
 
【正确答案】 C
【答案解析】 词义辨析。puncture“刺穿”;pinpoint“针尖”;punctual“准时的”;pernicious“有害的”。句中的语境为雾天和航班起飞,由此可判断空格处单词为punctual。故答案为C。