that boy is veryclever,he couldread ( 介词 ) the age of three

that boy is veryclever,he couldread ( 介词 ) the age of three john is a small boy .He likes () at the age of six.He raeds He ____　read ______ write at the age of three. He is the Newton of this age. The boy began to play chess at the age of three.（改为同义句） The he at the age of 5和 he is at the age of ( ) the age of three,应该用哪个介词?on at in to He is the tallest boy of the three.这个句子中形容词最高级前的the可以省略吗? The boy is so lovely that all of us like him 改为 he is __ __ he is at the age of five.行不行? 翻译He is at the age of 10. He is the boy of mine