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）She said to the twins, "Help
(you) to some fruit.”
（4）You should do your homework as
(careful) as your sister.
（5）The foreign teacher gave us some
(advice) on how to learn English.
（6） (teach) high school students in a poor mountain village may not sound like fun to you.
