Answer:
I fill a room but take no space.
I suck.
I am a sound made by felines when petted.
What time of day, when written in a capital letters, is the same forwards, backwards, and upside down?
I'm as simple as a circle worthless as a leader; but when I follow a group their strength increases tenfold. By myself I'm practically nothing.
What did the grape do when he got stepped on?