Billy and Sam were twins.They were in the same class.They were both very happy.One day their teacher asked the class to write a composition(作文)"My Mother".Sam wrote one,but Billy was lazy.He just copied his brother's.The next day,the teacher asked Billy why his composition was the same as Sam's."We have the same mother,don't we?" answered Billy.
根据短文内容判断句子正误,正确的填A,错误的填B.
（ ）26．Sam was older than Billy.
（ ）27．Sam and Billy were in different classes
（ ）28．The name of the composition was "My Mother"
（ ）29．Billy's composition was the same as Sam's
（ ）30．Billy was not lazy.He was very clever