The key to exercise solutions in chapter Unit 106 - Comparative 2 for the textbook English Grammar in Use with authors Raymond Murphy from Cambridge University Press
Question
Complete the sentences using the ... the ... .
Answer
The younger you are , the easier it is to learn.
The more tired you are, the harder it is to concentrate.
The sooner we decide (what to do), the better.
The more I know, the less I understand.
The more electricity you use, the higher your bill will be.
The more / The longer she had to wait, the more impatient she became.