The whole subject of children's thinking is a fascinating one. How do their minds work? Exactly what takes【C1】______when they learn? How by what【C2】______logic do they reach conclusions perfectly【C3】______to them but illogical to us? Much exciting【C4】______is going on in an effort to find【C5】______to these questions. Foremost is the【C6】______of Jean Piaget, the Swiss psychologist who pioneered the【C7】______and whose theories have had an unparalleled【C8】______on education, especially in Europe. He has【C9】______(in French)over twenty - five books and 150 articles【C10】______are a gold【C11】______of ideas about the development of a child's【C12】______. About half the books and a【C13】______of the articles have been translated into English,【C14】______his style. of writing and the【C15】______technical vocabulary make him a very【C16】______author to read in any language. Following Piaget's lead, there has been a【C17】______of research in a number of countries,【C18】______the United States. Reports of these【C19】______, too, are often so hedged about with a thicket of professional jargon that they are【C20】______to the nonspecialist. 【C1】