Answer:
I begin with the letter āiā, if you add āaā in front of me, I become a new word with a different meaning, but still sounds exactly the same. What word am I?
A large oasis in the desert. Come with cash and leave with none.
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
I go up when the rain comes down
I am a path between high natural masses; remove the first letter to get a path between man-made masses.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.