1 . His friendliness and kindness gave us a strong ________. In other words, we were all ________ by his friendliness and kindness.(impress) (用所给词的适当形式填空)

2 . And it came to me then how much easier it would be if we had ______ range of words that express different grades of gratitude (感谢).

3 . Science works with concepts of averages which are far too general to do justice ______ the subjective variety of an individual life. (用适当的词填空)

4 . Seeing the falling plane, painful memories of terrorist attack on Sept. 11, 2001 ______ (闪过) across his mind. (根据汉语提示单词拼写)