Complete each of the following sentences with a (compound) word derived from the one(s) given in brackets.
You ought to drive very cautiously on such a （ ）day. (fog)
【正确答案】：FOGGY
【题目解析】：
根据前文on such a（在如此······）和后文day（天气）可知空格处应填fog的形容词形式foggy，多雾的。
句意：在如此多雾的天，你应该谨慎驾驶。