Good Riddles

Question: A computer walks up to two stores, one called '1', and one called '0'. Which does it choose?

Question: It takes one word to separate them; otherwise they are inseparable.

What are they?

Question: I have four wings, but cannot fly.
I never laugh and never cry;
On the same spot I'm always found, toiling away with a little sound.

What am I?

Question: What always goes to bed with its shoes on?

Question: If you have two twins, three triplets and four quadruplets; how many people do you have?