Read the text and choose the correct answer:
I’m so tired (so / because) I’ve just spent the whole day
cleaning the apartment! It was my birthday yesterday, (as / so) we
invited a few friends round. I work in another city most of the time. (Therefore / Since) I
can’t see my friends as often as I’d like to. Anyway, we had a big party last
night. (Because / As
a result), our apartment was in a
terrible mess this morning. Still, it was worth it (as / therefore) we had a really good time. I’m
going to bed now, (as
a result / since) I have to get up early for work in the morning. I’ve got a
busy week, (so / as)
I need to have a good rest.