Number sequences: 6X000X9, 700XX08,00000015,?,00000015

Here is the question:

6X000X9，700XX08，00000015，？，00000015，？，00000015

This question actually comes from the puzzles made by my friend. He gave me his puzzles recently but I couldn't figure it out. Any clues?

Hint1

For question 10, odd terms are comprised of 1234567890

Hint2

For question 11, the first number is 6,7,8,9,10

Hint3

For question 13, odd terms are comprised of 123456