第四部分 单词拼写（共10小题；每小题0.5分，满分5分）
根据首字母或中文提示，结合句意，写出下列句中所缺单词。
71.As is known to all, Chaplin was a famous c_________.
72.Boats are p___________(禁止)from entering this area in order to keep the dolphins safe.
73.His only chance of s________ was a heart operation, or he will die soon.
