Is there any mistake in your homework，Jim？
I'm not sure．I （not check）it carefully．
I don't think he stole the painting．When he （ask）what he was doing at 7 yesterday evening，he was very calm．
My computer fan doesn't work．Where can I have it （repair）？
Why didn't you come to open the door for me？
I （wash）dishes in the kitchen and didn't hear the doorbell．
I didn't know （teach）children when I started to work in a primary school．