________ is more difficult.

1. A.
   Twelve Lesson
2. B.
   Lesson Twelfth
3. C.
   The Twelfth Lesson
4. D.
   Twelfth Lesson

December is ______ month of the year.
A. twelve               
B. the twelfth             
C. the twelveth

There are ________ in a year．

1. A.
   twelve month
2. B.
   twelfth months
3. C.
   twelve months
4. D.
   twelfth month