Complete the sentences with the correct words

1. I'm 15 tomorrow! I'll have the best
   [ ][ ].
2. It's my
   [ ]
   day tomorrow. I've finally finished university!
3. They have finally bought a house! What shall we give them as a
   [ ]
   gift?
4. My grandparents got married 30 years ago. It's their
   [ ][ ]
   today.
5. On this day, they celebrate the
   [ ]
   of their country.