Betty，Peter，BillandAnnareMary'scousins．Maryistheoldestofthefive．Bettyisthirteenyearsold．SheistwoyearsyoungerthanMaryandoneyearolderthanPeter．Billisnine，andAnnisseven．Sheistheyoungest．BettyandPete

　　Betty，Peter，Bill and Ann are Mary's cousins．Mary is the oldest of the five．Betty is thirteen years old．She is two years younger than Mary and one year older than Peter．Bill is nine，and Ann is seven．She is the youngest．

　　Betty and Peter are good runners．But Peter runs faster．Mary and Ann like to play basketball．Mary plays better than Ann．Bill is the best singer of the five．Mary and Betty study in a middle school．Peter，Bill and Ann study in a primary school．The five children all work hard at school．But Betty works hardest．

　　根据短文判断下列句子的正（T）误（F）．

　　21．Mary has four cousins．___

　　22．Betty is younger than Mary．___

　　23．Betty runs faster than Peter．___

　　24．Mary plays basketball as well as Ann．___

　　25．Peter，Bill and Betty study in the same school．___．