【单选题】How old are you? [ ]
A.
I'm nineteen years old.
B.
I'm nineteen year old.
【单选题】Twelve plus seven is ____________. [ ]
【单选题】Flight nineteen from New York to Washington is now arriving at__________.
【单选题】Nineteen ____________ eleven is eight. [ ]
【单选题】I am ______ years old, and next Sunday is my _______ birthday.