What does this rebus means ?

PROG WORKRESS

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

It is a 5 letter word if you take away first letter it is something you get from sun, if you remove second letter you will get something to eat, if you remove third letter you get a word you use in pointing at and if you remove the fourth letter you get something to drink. What is it?

There is something which is always coming but never arrives?

Count the number of times the letter "F" appears in the following paragraph:

FAY FRIED FIFTY POUNDS OF
SALTED FISH AND THREE POUNDS
OF DRY FENNEL FOR DINNER FOR
FORTY MEMBERS OF HER FATHER'S FAMILY.