Объяснение:
Watching television has its good and bad sides. Teenagers should not watch television too much time it's bad affects on eyes and wastes their time. On the flip side TV is the main source of information in the world and if we want to know actual events happening right now we need to switch on the TV and watch the news. Moreover, some programmes are very good for intellectual development, they can teach us something new. But anyway there are lots of other ways to spend leisure time except television
2. David is studying Chinese now.
3. I am working at the moment.
4. The dogs are eating in the kitchen now.
5. Sarah is has breakfast. now.
P.S. в 3 предложении нету now , так как есть уже at the moment - в данный момент