Let's solve the crossword puzzle by finding the opposites of the given adjectives:
1. Interesting - BORING (already filled in)
2. Lazy - ENERGETIC
3. Dirty - CLEAN
4. Safe - DANGEROUS
5. Clean - DIRTY
6. Cheap - EXPENSIVE
7. Dangerous - SAFE
8. Beautiful - UGLY
9. Energetic - LAZY
Now, let's fill in the crossword puzzle:
```
```
1b o r i n g
2 e
3 c l e a n
4 d a n g e r o u s
5 d i r t y
6 e x p e n s i v e
7 s a f e
8 u g l y
9 l a z y
```
```
The mystery word (reading down the first column) is BEAUTIFUL.
My country is the most beautiful country in the world!
**Answer to the question: BEAUTIFUL**