+0
Excitement is so widespread that pubs, having been used to three or four costumers, take on extra staff.
And this is all as a result of these wonderful foreigners who decided to move here so that we could make
more money and lead a normal sort of life.
And they have done it in such a way that everyone has benefited.
When they then say that, as a result of a stronger curency, high interest rates, etc. they have decided that they have to shed jobs or else close down completely, it comes as a shock.

Do we need as there?
+0
Nope Incho.

It is a common structure; as a result (of) means due to /owing to / because of.
+0
I'm trying to work out why a pub needs costumers?
Students: We have free audio pronunciation exercises.
Comments  
The task does not say how many words are missing; you have to fill in the gaps, you do not know where, in the text.

Gone are the days when local inhabitants would treat news that foregn investors were intent on starting up operations in their area without suspicion. Now such announcements are greeted with joy by the long-term unemployed who see light at the end of a long tunnel.
The immediate and most significant effect is a wage-packet.
The second is a lightening of the depression that descends on the town as a result of years of stagnation.
Shops long boarded up start re-opening, high-streets become filled with people - people smiling.
So (u)sed to empty streets and half empty shopping bags are the citizens that they assume this will go on for ever.
Discos with strange names open, restaurants serving such delicious Italian food that locals dream they are in Umbria do thriving business, cinema owners lose their frowns. Excitement is so widespread that pubs, having been used to three or four costumers, take on extra staff. And this is all as a result of these wonderful foreigners who decided to move here so that we could make more money and lead a normal sort of life. And they have done it in such a way that everybody has benefited. When they then say that, as a result of a stronger currency, high interest rates, etc. they have decided that they have to shed jobs or else close down completely, it comes as a shock

These are my answers, but the key does not agree with me.
"And this is all as a result," part I do not agrre with. While I can go along with those who say with as the sentence is correct, I can not yield to arguments that only with as is the sentence correct. The task said the missing words were to be fit in.
I know what as a result of means, but do we have to use an idiom there?
Site Hint: Check out our list of pronunciation videos.
anybody?