填空题 It with cost you very little to give the boy 1 once in a while; he needs encouragement.
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【正确答案】 1、a pat on the back    
【答案解析】解析： It will cost you very little to give the boy a pat on the back(赞扬，鼓励)once in a while(偶尔); he needs encouragement(鼓励). 这将花费你很少给孩子偶尔的赞扬