What do these numbers from the article refer to? 100 billion 1998 six 200 15 eight zero

1. At breakfast, we eat sandwiches.
2. We sometimes write dictations.
3. Do you play chess? No, I do not play chess, but I play checkers.
4. I never go to the gym. But I regularly run on the beach in the morning.
5. In the evening he attends English classes.
6. I often listen to the radio in the morning.
7. They live in the same street.
8. He studies the history of Russia.
9. The girl likes to walk in the park.
10. My brother is very good at playing the violin.
11. Today is a sunny and calm morning.
12. I usually spend the summer with my grandmother in the country.
13. For breakfast, I drink coffee with a sandwich.

1) Fred constantly comes to school unprepared for his classes.
2) Bob always drives carefully.
3) We are heard Lycy is getting married. (passive voice)
4) I forget that Aunt Mary is arriving on Wednesday.
5) David's wife and his sister constantly buy expensive clothes.
6) We are told they're going to the Crimea for the summer. (passive voice)
7) I often see Philip in the library there days.-Yes, he is preparing for his spring exams.
8) Is Joanna Rowling writing a new Harry Potter book? 
9) My uncle says they are building a new garage.
10 ) Harry always forgets to say hello.