1. October (Typically, calendars are sold in October for the following year.)

2. November 30 (Competitions often have deadlines at the end of the month before the new year.)

3. a photograph (Usually, front pictures are described as photographs.)

4. 12 (Calendars usually feature 12 pictures, one for each month.)

5. Miss (Typically, the pictures are sent to a specific teacher, often referred to as Miss or Mrs. followed by their last name.)

So the answers are:

1. October
2. November 30
3. a photograph
4. 12
5. Miss