选词填空。
Tom has __________ (few; fewer) Christmas cards than I.
They believe that there will be __________ (less; fewer) green trees in fifty years.
He is ill and he can eat _________ (more; less) food, so he gets quite weak.
The ________ (more; much) we get together, the ________ (happy; happier) we’ll be.
David has _______ (less; fewer) money than Anna has.