Ответ:
1. I am not very good at Maths.
2. Mice are afraid of cats.
3. My teacher was very pleased with my progress in English.
4. Why are you so angry at me?
5. Is your brother interested in computer science?
6. What does your decision depend on?
7. Peter's friends congratulated him on receiving the first prize in the Language contest.
8. The teacher explained a new grammar rule to the pupils.
9. We were impressed by the castle's splendour.
10. Nobody was surprised by her winning the award.
11. When we arrived at the railway station, the train had already left.
12. When we arrived in London, it was raining heavily.
13. Geographically the UK is divided into two parts.
14. The region continues to suffer from serious pollution.
15. What music are you listening to?
16. The sides have agreed to participate in the peace talks.
17. I have always been dreaming of visiting London.
18. Just nod your head, if you agree with me.