A. Most fortunate, the doctors knew what to do about my sore foot.
B. Fortunately, the doctors knew what to do about my sore foot.

1. After a long flight through bad weather, our plane landed safely.
2. After a long flight through bad weather, our plane landed safer.

위에 적은 문장들이 문법적으로 전부 맞는건가요?
아이 문법 숙제인데 헷갈리네요.