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it，be，because，what，else，by，invent，clean，popular，either，habit，hundred
There is a small thing we use every day. We usually put 1 in the bathroom. Without it，we might have tooth problems. Can you guess 2 it is? Yes，it's the toothbrush. But do you know anything about its history?
According to some research，before toothbrushes appeared，the ancient Chinese people 3 their teeth with some small tree branches. About 800 years ago，people made a kind of brush with pig hair and bamboo. It might 4 the world's earliest form of toothbrushes. As time went 5，the forms of toothbrushes changed. For example，people chose horse - tail hair instead of pig hair 6 pig hair was too hard. Imagine that you travel back to 7 of years ago and brush your teeth comfortably. It sounds fantastic，doesn't it?
Around the 15th century，the Chinese toothbrush found its way into Europe. It became 8 among local people soon. The 9 of toothbrushes was not as famous as that of paper - making，but it was very useful in daily life. Today we have a good 10 of brushing teeth. We should thank the ancient Chinese for it.

F(2025·南通市海安期末改编)
stay up，recent，them，find，true，show，medicine，achieve，ask，create
“Look in my eyes. Tell me why.” Have you found yourself listening to “ancient people” online 1?
2 vloggers (视频博主) are using AI technology to bring some famous people from history like the Tang dynasty poets Li Bai and Du Fu “back to life”. These videos have become more popular，3 these ancient icons speaking in a modern language.
In one video，Du Fu talks about his special experience during the An - Shi Rebellion (755—763). In another video，the Ming dynasty 4 scientist Li Shizhen makes fun of modern lifestyles，like trying to be healthy by drinking goji berry (枸杞) water but still 5 late.
“The videos make me want to learn more about important ancient people. I didn't know much about their stories before，” said Wang Jiayi，15，from Shandong.
However，the new trend isn't for everyone. The way these ancient people speak，in high tones and always 6 questions，causes some people to be angry. “They're too pushy，which is different from how they 7 were，” said 14 - year - old Wang Shuotong from Jiangsu.
Xia Boen，14，from Hubei，felt the same. But he was very surprised 8 that he could remember almost everything they said about their own interesting experiences and great 9 thanks to the speaking style in the videos.
These videos use a more modern way to let ancient people “speak for 10”. “But we should be careful with these videos，making sure they are not sharing fake information，” noted Nanfang Daily.