23、One possible version:

       Tom is shocked to find three months’ summer vacation has flown away from him. He wonders what he has been doing during such a long time. Then he remembers the days which he spent talking and laughing nonstop with his friends and the websites which he hung on surfing day and night. He regrets having wasted his time this way. But you see, when he sits in front of the computer again, he immediately becomes a crazy bull once more. Addiction is really hard to shake off.