1. 根据语境从方框中选择恰当的单词填空，有的需要变换形式。

feel,   difficult,   subject,   general

1. （1） Jack has no in driving the truck. He is experienced.
3. （2） Theidea is to wait and see.
   
5. （3） I have athat he won't attend the meeting.
7. （4） Theof this article is clear. It's about how to keep healthy.