Describe a serious and focused sentence

The sentences describing serious concentration are:

1. Xiaoming sat at his desk and could see that he was absorbed in the topic of his composition. As if a steady stream of spring water flowed from his pen, it was finished in a short time.

My brother is crazy about cartoons. All he has to do is look at them, ignore everything and stare at the TV screen.

3. Concentration is the key to success and the characteristic of a healthy mind.

When he was trying, he met a problem. He was flushed, his eyebrows twisted into a knot, and even the veins stood out on his arms could be clearly seen.

When you are integrated with what you care about, you won't let yourself wander in anxiety.

His wonderful speech deeply attracted the audience under the stage, and thousands of venues were silent. Like all the audience, she sat up straight and listened attentively.

7. Xiaohong frowned after seeing the topic of the math exam, and habitually moved his left thumb back and forth under his lips, thinking about the solution.

8. The power of dripping water can penetrate the stone, relying on the power of concentration; Rain is difficult to do because the power is too scattered. Too many choices are often a major cause of failure in life. You can experience many things in life, but you can only do one thing well.