问题补充：
fire, all exits must be kept clear.
A. In place of
B. Instead of
C. In case of
D. In spite of
答案：
A. In place of
B. Instead of
(答案→)C. In case of
D. In spite of
解析：根据题干“为了以防火灾，所有出口必须保持畅通。”，只能选C。in place of代替；instead of代替；in case of以防万一；in spite of尽管，虽然
