Sample Missing Odd Number

Find the missing even number.
1. 1,3,5,7,
2. 17,19, ,23,25
3. 43, ,47,49,51
4. 23,25, ,29,31
5. 51,53,55, ,59
6. 73, ,77,79,81
7. 65,67,69,71,
8. ,81,83,85,87
9. 33,35,37,39,
10. 91, ,95,97,99