选择正确的词语填空。 

1. Dale has _______ ( few；fewer) Christmas cards than I have.

2. They believe that there will be ______( less；fewer) green trees in fifty years.

3. He is ill and he can eat ________ ( more；less) food. So he gets quite weak.

4. The father said to his son,"The _________( more；much) , the better. "

5. David has ___________(less; fewer)money than Anna has.