24. When do you think this bridge was built? (OLD)

23. Some of Peter’s expressions make me think of my brother.
(REMIND)

22. You can avoid tooth decay by brushing your teeth regularly.
(PREVENT)

21. Most stores will accept a credit card instead of cash.
(ALTERNATIVE)
 

20. They failed to find out a solution to the problem.
→They didn’t succeed 

19. He was sorry he hadn’t said goodbye to her at the airport.
→He regretted 

18. It takes six hours to drive from here to London.

It is...

17. We’ve run out of petrol.

16. That was a silly thing to say!

15. A man I don’t know told me about that.