Answer:
What is filled with air and sometimes a gas, tied to a string and often seen on your birthday?
It's shorter than the rest, but when you're happy, you raise it up like it's the best. What is it?
You can carry it everywhere you go, and it does not get heavy. What is it?
Something you carry while singing.
What should you do when you see a green man?
When is it bad luck to see a black cat?