Answer:
How many people are dead in a standard grave yard?
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
No matter how little or how much you use me, you change me every month. What am I?
I am million people's wakeup call. What am I?
Edible items purchased in large quantities.
Dry though I may be, I am still a sea.