Answer:
I begin your sentences.
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
What word sounds the same even after you take away four of its five letters?
What two things can you never eat for breakfast?
There's not a kingdom on the earth I haven't traveled over and over and though I know not whence my birth yet when I come you know my roar. I through the town do take my flight and through the fields and meadows green and whether it be day or night I neither am nor can be seen.
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.