用所给单词的适当形式填空。
1. Tom______(swim) for two hours in the river.
2. When______you______(buy) the new computer?
3. When I entered the classroom, I found some students______(watch) TV.
4. There are some children who______(play) football on the playground.
5. —How long______ you______ (do) that?
—For about five years.
