one f_____ is twelve inches

Twelve inches is one foot 中间为什么用is 不是用are 英语奥数题,Each brick in one row is 6 inches long.Each brick in t SYCAMORE WITH UNICORN CORE,TWELVE AND A QUARTER INCHES,UNBEN Twenty and twenty is f_____. Today is her （twelve）birthday The baby is only one （year）old The boy is twelve years old and he is one of the best studen jim is twelve ___old ,but his brother is only one ___old Tamara is twelve years old.She was in junior one.She was a g The job is so boring that one _________ (twelve) of the work My sister is twelve.(对twelve提问) Lucy is twelve对twelve提问 julia is twelve对twelve提问