Ответ:

  1. Water boils at 100 degrees Celsius. — OK.
  2. How often do you go to the cinema?
  3. Ben is trying to find a job, but he hasn’t had any luck yet.
  4. Martina phones her mother every day.
  5. The moon goes round the earth in about 27 days. — OK.
  6. Can you hear those people? What are they talking about?
  7. What do you do in your spare time? — OK.
  8. Sarah is a vegetarian. She doesn’t eat meat. — OK.
  9. I must go now. It is getting late.
  10. ‘Come on! It’s time to leave.’ ‘OK, I’m coming.’
  11. Paul is never late. He’s always starting work on time. — OK.
  12. They don’t get on well. They’re always arguing. — OK.

Present simple is used for facts, routines and states; present continuous is used for actions happening now, temporary situations and repeated annoying behaviour.