根据句意和所给的首字母提示，补全句子中的单词。

1．Luckily，there were no i           in the accident．

2．She is s       a good teacher that we all like her．

3．There is a famous saying; A friend in need is a friend i         ．

4．Normally，it’s impolite to d        by a friend’s house without calling first．

5．This old man is healthy．His face is red and s         ．