2000 Honda Civic Won't Start
 

I have a 2000 Honda Civic DX, and I can't figure out what's wrong. I bought
it 2 years old with 50,000 Miles on it. It now has 138, 000 Miles on it, and
won't start. I checked and cleaned the rotors and plugs, and all 4 plugs send
spark. After I cleaned them with alcohol, and confirmed they sparked, I took
one out to check if fuel was getting all the way to the plug, and it smelled
like gas. I was told that the only thing left is the timing belt, but visual
inspection showed no signs of damage. Is the timing belt definitely need to
be changed to make the engine start, or could it be something else?