now attends is marked wrong and s'attenre is required!

Not necessarily - this could be a simple statement of fact ‘I am expecting to be fired” (perhaps while thinking,  “ but that is okay because I don’t like this job anyway”). 

Similar to English - ” I am expecting to lose my job “ and “ I am worried I will lose my job “ convey different reactions to the situation. 

Both "s'attendre à" and "s'attendre à ce que" can have negative connotations, although they don't always. I think the main difference between them is just grammatical. You only need the "ce que" when there's a clause with a second subject and conjugated verb, but in this case it's the same person and so it just uses an infinitive "être licencié".

now attends is marked wrong and s'attenre is required!

Son arrivée? Isn’t this a feminine ending?