Read text and answer the question below.
One man in a boat
L.G. Alexander
Fishing is my favourite sport. I often fish for hours without catching anything. But this does not worry me. Some fishermen are unlucky. Instead of catching fish, they catch old boots and rubbish. I am even less lucky. I never catch anything - not even old boots. After having spent whole mornings on the river, I always go home with an empty bag. “You must give up fishing!” my friends say. “It’s a waste of time.” But they don’t realize one important thing. I’m not really interested in fishing. I am only interested in sitting in a boat and doing nothing
The expression at all, in the last sentence from the text, is used