Here are the completed sentences:
1. Sam **plays** volleyball every Wednesday.
2. My sister **is making** a cake at the moment.
3. Roy **is staying** in today, but he usually **goes** out to dance every night.
4. Listen, somebody **is playing** the piano up there.
5. Nowadays, teenagers **spend** hours on social media.
6. My best friend **is riding** her horse now.
7. British people **write** hundreds of Christmas cards every year.
8. **Does she practice** sports in a club? - Yes, she does.
9. I **do not love** eating sweets.
10. My neighbors **invite** lots of people for dinner every week.
11. Johnny **is reading** a very interesting book right now.
12. Sally always **needs** some strong coffee in the morning.
13. I never **get up** before 7.30.
14. Rinda **is sending** an e-mail at the moment.
15. Be quiet! The baby **is sleeping** in his room.