Here are the correct options for each of the sentences:

14. Nowadays children adapt **C. quickly** to technical developments than their parents.

15. Mai loves **A. go** to the gym for about 30 minutes a day. She thinks doing exercises are good for her health.

16. How often do you **A. check** notifications on Facebook? - Once a day.

17. The workers are **A. unloading** a truck with timber.

18. Teenagers need encouragement from their parents, **C. but** not all parents are willing to encourage their children.