答案：

　　My grandparents live in the countryside.They keep a dog

　　Ah Bao.One day my grandparents

　　to work in the fields，taking along my little brother

　　and Ah Bao.My brother and Ah Bao came to a river nearby and enjoyed . My brother was trying to catch a butterfly

　　he fell into a river.Ah Bao barked and

　　jumped into

　　water.Hearing about him barking，my grandparents hurried there and saw Ah Bao swimming towards the bank carrying my brother. Ah Bao did all he could

　　save my little brother， moved all the people present.Everyone praised Ah Bao for his

　　and kindness.

　　解析：

　　第一处：calling→called　考查非谓语动词。根据dog是call的动作承受者，应用过去分词作定语。

　　第二处：go→went　考查时态。由全文可知，应该使用一般过去时。

　　第三处：himself→themselves　考查代词。根据该句的主语my brother and Ah Bao判断反身代词应用themselves。

　　第四处：while→when　考查连词。be doing...when...是固定句式，意为“正在做……(就在这时)突然……”。

　　第五处：immediate→immediately　考查形容词与副词。修饰动词jumped应该用副词。

　　第六处：a→the　考查冠词。river在前文已经提到，应用定冠词表特指。

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