Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
One important（ ）of the Coast Guard is to make sure that all ships dutifully follow traffic rules in busy harbors. (responsible)
【正确答案】：RESPONSIBILITY
【题目解析】：
本题考查的是常用形容词的名词。
由important可知，空缺处应填名词作主语，responsible的名词形式是responsibility意为“责任”。
句意：海岸警卫队的责任之一就是确保所有的轮船在繁忙的港口内有序地遵守交通规则。