根据句意，用括号内所给单词的适当形式填空。

1. They need to have a _______ (far) discussion on that problem, I'm afraid.

2. What strange _______ (suggest) you have offered!

3. When the _______ (disturb) news reached the chairperson, he felt really bad about it.

4. Peter has his way to do things, and his wife has _______ (she), but they never quarrel.

5. It is _______ (polite) of him to leave without saying anything.