Fantastic riddles

123
Across
  1. 1. You can catch it but never through it.
  2. 2. I"m the beginning of end, the end of space, not in start, and in the start of eight.
  3. 3. Pour people have it, ritch people need it, iff you eat it, you die.
Down
  1. 1. The man who invented it dosen't need it, the man who bought it dosen't wan't it, and the man who needs it dose n't know what it is.