Missing number Hangman

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<script type="text/javascript"src="http://www.studystack.com/hangmanjs-92978"></script><a href="http://www.studystack.com"><h5>More flashcards, word search, and hangman provided by StudyStack.com</h5></a>

Flap 1	Flap 2
1,2,3,4,____,6,7,8	5
5,6,____,8,9	7
6,7,____,9,10	8
13,____,15,16	14
10,____,12,13	11
15,16,____,18,19	17
17,18,____,20	19
4,5,____,7,8	6
12,13,____,15,16	14
8,9,____,11,12	10
5,6,____,8,9	7
12,13,14,____,16,17	15
2,3,____,5,6	4
7,8,____,10	9
6,5,____,3,2	4
9,8,____,6,5	7
12,11,____,9,8	10
17,16,____,14,13	15
13,14,____,16,17	15
10,9,8,____,6,5	7