Considering the use of AS, SINCE, BECAUSE it is true to say that the correct sentences are:

I. As it is raining again, we will have to stay at home.
II. As I was ill for six months, I lost my job.
III. You didn’t tell me the truth, because I found the money in your room.
IV. Since he had not paid his bill, his electricity was cut off.

The only correct affirmatives are