Іть будь ласка розкрити although the sun was shining it was still cold as it (rain) hard here you are at last. i (wait) for you fot fifteen minutes already by 8 o`clock i (writing) the report for 2 hours

Although the sun was shining it was still cold as it had been raining hard.
Here you are at last. I have been waiting for you fot fifteen minutes already.
By 8 o`clock I will have been writing the report for 2 hours