根据首字母提示,写出所缺单词。注意单词形式的变化。 1. He was healthy because he did physical exercise r______ . 2. The whole world was shocked at the fast d______ of the country. 3 . The house is s_____ by trees and flowers. 4. The book is useful for English learner , e______ for beginners. 5. I w_______ if you can do me a favour.