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—The duty of Project Hope is to help poor children,  isn't it?            
—Yes,  it has built many schools________are for those children.        

—The duty of Project Hope is to help poor children, isn't it?      
—Yes,it has built many schools______are for those children.

—The duty of Project Hope is to help poor children, isn't it?      
—Yes, it has built many schools _____ those children can study happily.       

— The duty of Project Hope is to help poor children, isn't it? 
— Yes, it has built many schools ______ those children can study happily.

—The duty of Project Hope is to help poor children, isn't it?
—Yes, it has built many schools            those children can study happily.