What's the next sentence?

While the iron is hot, you need to be hard. The next sentence is:

1, while the iron is hot, you need to be hard, and you don't need to whip yourself.

2, while the iron is hot, you still need to be hard, and you can produce fine steel after a hundred trials.

3, while the iron is hot, it needs to be hard, and being an official is more important.

4, while the iron is hot, you still need to be hard. If you want to achieve something, you must first have your own conditions.

5, it is necessary to be hard to strike while the iron is hot, and embroidery should be skillful.

6, while the iron is hot, you still need to be hard, opportunistic, wrong!

7, while the iron is hot, it needs to be hard by itself, and it needs a lot of tempering to become steel.

8. It's hard to strike while the iron is hot. It's natural to have someone to help you, but you have to have the ability.

9. While the iron is hot, you need to be hard. Only after a lot of training can you acquire a skill.