Ответ:
A 1. He is a good friend.
2. He speaks English very well.
3. His English is rather good.
B 1. He can jump very highly. (не уверена)
2. He is a high skilled mechanic.
C 1. Ann has written her test better than Kate.
2. Nick lives farther from school than I do.
3. Elena is the best singer. She sings beautifully (не уверена)
4. They will invite her to the interview sooner than the other firms.
5. It was a very difficult project. We worked longer than ever.
Извиняюсь если есть ошибки!