John is not very — he often forgets what he promises to do.
Tom is keen _____ surfing the Internet in his spare time.
The students were completely _____ in their reading.
She missed the plane, _____ driving very fast to the airport.
My brother is really _____. He often works in his office far into the night.
There is ____ universal concept among ____ parents that the more they feed their kids, the healthier they will grow up to be.