Choose the right forms of the adverbs to complete the sentences.

Choose the correct option.

Robert runs [faster |more fast|fastest|first] than his friend.

I speak French [fluentlier |more fluently|fluentliest |most fluent] now than two years ago.

Mrs Lawrence greeted me [politelier |more politely|politeliest |most politely] of all teachers.

Planes fly [higher |more high|highest |most high] than any bird.