二、用所给词的正确形式填空:
1. She will be much ______ (happy) in her new class.
2. The short one is _______ (useful) of the five.
3. His sister is two years _______ (young) than him.
1. She will be much ______ (happy) in her new class.
2. The short one is _______ (useful) of the five.
3. His sister is two years _______ (young) than him.