What songs do you think do you think the acts and the mentors will do for their duet?

Amelia and Kelly - When Love Takes Over
Marcus and Gary - Rule The World (although Shine would suit Marcus better)
Little Mix and Tulisa - I am assuming a cover?

Surely it will be unfair if Tulisa and Little Mix do a cover with the others singing their own songs, kinda defeats the purpose of singing with their mentors, but I can't see them doing an N Dubz song!

The songs have been announced already.