Today I'd like to tell you something that I experience in the City Park．In the afternoon of last Sunday，my friend and I were taking a walk along a river in the City Park，when suddenly we heard a boy call for help in the river．We jumped into the river or pulled the boy out．Then we made him to breathe using the mouth-to-mouth way．After a while，the boy came to himself，∧we sent her to hospital at once and telephoned his parents．The boy was saved．His parents were very thankful∧us and the doctors thought high of our first aid．From this，we realized that knowing first aid is help and important because it can help us to save lives．
详
1．答案experience改为experienced．考查时态．根据后文"the afternoon of last Sunday"可知，作者经历的这件事发生在过去，用一般过去时，用experienced．
2．答案In改为On．考查介词．在具体的某一天，介词用on．此处指上个星期天的下午，故用on．in用于泛指的早上、下午、晚上，没有具体的哪一天．
3．答案call改为calling．考查动词V-ing形式．hear sb．doing sth．听见某人正在做某事（正在进行）．hear sb．do sth．听见某人做某事（整个过程）．此处指我们听见一个男孩在喊救命，听见的时候，call这个动作正在发生，故用calling．
4．答案or改为and．考查连词．根据前后文关系，我们跳入河中，并把男孩拉了出来．前后位并列递进关系，用and．
5．答案him后去掉to．考查动词不定式．make sb．do sth．让某人做某事．去掉to．
6．答案we sent前加and．考查连词．the boy came to himself为一句话，we sent her to hospital at once and telephoned his parents为另一句话，两句话之间须有连词，此处加and，为并列关系，男孩醒了，我们送他去医院．
7．答案her改为him．考查代词．根据前文"the boy came to himself"可知，此处指代the boy，故her改为him．
8．答案thankful后加to．考查介词．be thankful to sb．感谢某人，感激某人．
9．答案high改为highly．考查副词．think highly of 为固定词组，意为"高度赞扬，高度评价"．
10．答案help改为helpful．考查形容词．is为be动词，be动词后多用形容词作表语，故help改为形容词helpful． Today I'd like to tell you something that I experience in the City Park．In the afternoon of last Sunday，my friend and I were taking a walk along a river in the City Park，when suddenly we heard a boy call for help in the river．We jumped into the river or pulled the boy out．Then we made him to breathe using the mouth-to-mouth way．After a while，the boy came to himself，∧we sent her to hospital at once and telephoned his parents．The boy was saved．His parents were very thankful∧us and the doctors thought high of our first aid．From this，we realized that knowing first aid is help and important because it can help us to save lives．
详
1．答案experience改为experienced．考查时态．根据后文"the afternoon of last Sunday"可知，作者经历的这件事发生在过去，用一般过去时，用experienced．
2．答案In改为On．考查介词．在具体的某一天，介词用on．此处指上个星期天的下午，故用on．in用于泛指的早上、下午、晚上，没有具体的哪一天．
3．答案call改为calling．考查动词V-ing形式．hear sb．doing sth．听见某人正在做某事（正在进行）．hear sb．do sth．听见某人做某事（整个过程）．此处指我们听见一个男孩在喊救命，听见的时候，call这个动作正在发生，故用calling．
4．答案or改为and．考查连词．根据前后文关系，我们跳入河中，并把男孩拉了出来．前后位并列递进关系，用and．
5．答案him后去掉to．考查动词不定式．make sb．do sth．让某人做某事．去掉to．
6．答案we sent前加and．考查连词．the boy came to himself为一句话，we sent her to hospital at once and telephoned his parents为另一句话，两句话之间须有连词，此处加and，为并列关系，男孩醒了，我们送他去医院．
7．答案her改为him．考查代词．根据前文"the boy came to himself"可知，此处指代the boy，故her改为him．
8．答案thankful后加to．考查介词．be thankful to sb．感谢某人，感激某人．
9．答案high改为highly．考查副词．think highly of 为固定词组，意为"高度赞扬，高度评价"．
10．答案help改为helpful．考查形容词．is为be动词，be动词后多用形容词作表语，故help改为形容词helpful．