1. (2016·徐州) 根据句子意思，用括号中所给单词的正确形式填空。（每空限填一个单词）

1. （1） Robin never bought (I) a drink when we were together.
3. （2） Sandy came first in the race. She ran the  (fast) of all.
5. （3） We will provide a high level of  (serve).
7. （4） I had the  (comfortable) feeling that I did it wrong.
9. （5） I'm not  (worry) about my younger sister-she can take care of herself.