Missing numbers.

Can you find which numbers are missing here?

23, 9, 10, 15, 9, ??, 29, 10, 31, 10, 14

15, 175, 671, 1695, 3439, ??

10, 18, 24, 28, ??, 30

999, 9999, 99000, 989001, 9890001, ???, 989010999

0, 8, 7, 15, 5, 13, 12, ??, 1, 9, 8, 16

1, 21, 54, 454, 959, ???

112, 122, 312, 232, ??, 122, 323, 342, ??, 344