How to insert a column inside a dataset with awk?

Hello folks
I have a file called fill1.txt which contains:

1 2 
2 1
1 2
1 2

my other file is called fill2.txt which contains:

1 2 1 2 2 2 1 2 1 2
1 1 2 1 1 2 1 1 1 1
2 2 2 1 1 2 2 1 1 2
1 1 1 2 2 2 1 2 2 1

Now, I am looking for a awk command which could insert fill1.txt between column 6-7 in fill2.txt. If anyone could give me any solution for this particular question, I will be appreciated.

Regards
Sajmar

Try:

awk '(getline p<f)>0{$7=p OFS $7}1' f=fill1.txt fill2.txt

or

awk 'NR==FNR{A[FNR]=$0; next} {$7=A[FNR] OFS $7}1' fill1.txt fill2.txt