12. C. have visited
13. D. What's wrong
14. A. missed
VII.
1. He was a famous American writer.
2. He was born in a small town on the Missouri River in the USA.
3. When his father died, he was 12.
4. Yes, they did.
5. It was published in 1876.
VIII.
1. Mary suggested going out for dinner.
2. John is not old enough to understand the question.
3. I haven't heard from my sister for 5 months.
4. It was such a heavy box that my cousin couldn't carry it.
IX.
1. was cooking
2. goes
3. are playing
4. Did you go
5. bring
X.
1. B. It does not make them carry the weight of their body on their feet
2. A. gradually
3. B. at least two or three times a week
4. C. it is a sign of exercise having the right effect
5. D. Making you look younger