twelve_____ twenty_____( 序数词) knife_______(复数) out_____ open______(反义词)

twelve_____ twenty_____( 序数词) knife_______(复数) out_____ open______(反义词) 找规律,写数字1.four,____,twelve_____,_____2.three,six._____,twelve,______,______3.ten,twelve,_____,____,______,twenty4.one,three,six,____,_____,twenty-one请说明为什么 Each play _____ one move to a question.The girls are getting on well____each other.I n the factory there was a big workshop and in it____(be)fifty people.Did you____at the door at nine yesterday?Why did the little boy cry______you?Twelve_____(person)