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2. I don't like History. I think it's enough difficult.

3. I don't like lemons. They are too sour.

4. Bob can't go climbing because he isn't good. enough.

5. Ben will win a gold medal one day. He is good too.

6. Is Stella smart enough to become a doctor?

7. I hope you're not going out tonight. It's too cold.

8. The little girl was too shy to sing at the concert.

9. Tom has been ill. He's not well enough to go to school.