填空题 Nothing could 1(weak) his resolve to continue to serve the community.
【正确答案】
【答案解析】weaken[解析] 助动词could后面要跟动词原形，故此句需要形容词weak(弱的)的动词形式weaken(变弱)；动词后缀-en；类似词汇：widen(加宽)，quicken(加快)，soften(变柔软)，harden(变硬)等。