题目内容
13．To keep healthy，I decideto exercise（exercise） half an hour every day．分析 为了保持健康，我决定每天锻炼半小时．
解答 答案：to exercise．decide后面经常跟动词不定式，也就是decide to do sth．意思是"决定做某事"，结合给出的英语提示"exercise"为动词"锻炼"，故填to exercise．
点评 首先要掌握decide这个词的用法，然后结合给出的英语提示，所以后面要用动词不定式．
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