Раскрыть скобки по: Past simple и past continuous

Nowadays there are a lot of different devices preventing teens to read. Children spend much time playing computer games or surfing the internet instead of reading books. As for me I like reading books about adventures or detective stories. In my free time I usually go for a walk with my friends. I try to be more in the open air and to do sport. In winter I ski or skate. In summer I often swim or jug in the park. In cold days I go to gym. And of cause like all teens I spend some time to surf the internet.