Make the correct derivative form of the word №9 in brackets.
It was a really 1 \(dread\) weekend last month. In forty-eight hours almost every 2 \(electricity\) appliance in the house broke down. The computer was first. A message appeared saying "Disk 3 \(fail\)". Next was the washing machine. I heard a terrible noise like an 4 \(explode\) and soon the laundry was full of smoke. I managed to 5 \(plug\) the machine just before it caught fire. 6 \(Believe\) as it may seem, the fridge stopped working the same day. It started to 7 \(frost\) itself for no reason and there was water all over the kitchen floor. By then I was a 8 \(nerve\) wreck. I was just falling 9___________ \(sleep\) when my toothbrush started buzzing. It was buzzing so 10 \(nagging\) that I had to get up and switch it off.