Answer:
nos is the answer I believe
'A la' would be your answer
It would not be al- al is mixing 'a' and 'el' (anytime you have 'a' and 'el' next to each other you ALWAYS combine it to be 'al'.)
It would not be 'a el' because of the same rule I showed you up above, it is improper.
Hope this helps :)
1. Aunque
2.para que
3.tan pronto
4.en cuanto
5.para que
6.con tal de que