15. Computers learn faster and faster since they were invented.
16. The monitor always gets to school on time is a good example for his classmates.
17. At the end of this month, we will have been here for ten years.
18. He was shocked to discover that he had no money left in his account.
19. Beethoven's Fifth Symphony is going to be performed next week.
20. When I was a child, winters would be colder than now.