1. A. has been

2. B. studies

3. A. used to/lived

4. C. because

5. D. on

6. A. pollution

7. B. was playing

8. C. who

9. C. careful

10. D. forecast

11. A. more fluently

12. C. shall we

13. B. ceremony

14. D. put off

15. B. That’s very kind of you

1. D. washed

2. C. lives

3. A. many

4. B. humour

5. C. infectious

1. B. invited

2. C. bring

3. A. gift

4. D. polite

5. A. Although

1. Mark Twain was a famous American writer.

2. He was born in a small town on the Missouri River in the USA

3. He was twelve years old

4. Yes, they did.

5. His best novel was published in 1876.