用所给单词的适当形式填空。 
（1）December is the ____  (twelve) month of a year.
（2）As we all know, the silk dress feels____ (soft).
（3）You should do your homework as ____ (careful) as your sister.
（4）The foreign teacher gave us some ____  (advice) on how to learn English.
（5）____ (teach) high school students in a poor mountain village may not sound like fun to you.