根据括号中的数字填写合适的序数词或基数词(写单词)。 1、Bill is _________(11)years old , he is in Class_______(2)Grade_______(4). 2、My birthday is on the_______________(3)of March . 3、September is the _______________(9)month in a year . 4、Which boy is thinner , the ______________(1)one or the ___________(2)one ? 5、There are _____________(12)apples on the desk .