From Henry Dudeney’s 300 Best Word Puzzles:

1. What is that from which you may take away the whole and yet have some left?
2. What is it which goes with an automobile, and comes with it; is of no use to it, and yet the automobile cannot move without it?
3. Take away my first letter and I remain unchanged; take away my second letter and I remain unchanged; take away my third letter and I remain unchanged; take away all my letters and still I remain exactly the same.