1. He is the tallest in our class.

2. The longest river in China is the Changjiang River.

3. It is the most delicious meal I have ever had.

4. You are my best friend.

5. He runs fastest in the race.

6. He is the cleverest boy in my opinion.

7. Sunset is the most beautiful scene I have seen.

8. Do you know which mountain is the highest one？

9. Reciting the text is the most difficult task for me.

10. Changjinhu is the most impressive film this year.

这些句子使用了不同的最高级形式，如tallest, longest, most delicious, best, fastest, cleverest, most beautiful, highest, most difficult, and most impressive，帮助描述在某个特定领域或方面的极端情况。希望这些句子能帮助你在英语学习中更好地使用最高级。