求用所给单词的适当形式填空：1. How cool! That college student is _________

求用所给单词的适当形式填空：
1. How cool! That college student is _________(unable) to speak four kinds of languages.
2. -What are the shudents doing over there?
-they are talking about different ways of _________(apent) the hoilday.
3. They are twins.I can't tell the ______(different) betwwen them.