Which one is correct?

I feel ... about what I have to do.

• undoubting

• doubtless

The eagle flies ...

• height

• high

It would be difficult to find a man ... than he is.

• braver

• bravest

Have you any ... questions?

• further

• far

The ... is the night, the ... is the day.

• longest; shortest

• longer; shorter

The ... you forget, the ... you know.

• more; less

• most; least

It's very ... for you to shout at such a little girl.

• impolite

• unpolite

Are all the mushrooms ... ?

• eatable

• edible

You must learn all the forms of ... verbs.

• unregular

• irregular

Don't be ... by the appearance.

• misled

• missled