1-C. It was not until the latter half of the 19th century that they became widely popular.It was not until the latter half of the 19th century that they became widely popular.  

次が、ありませんでした、後半までダヨ、19世紀のダヨ、それらが広く普及するようになったことがダヨ。  

2-C. Deja vu, however, is not uncommon and has been the subject of scientific studies since the 19th century.Deja vu, however, is not uncommon and has been the subject of scientific studies since the 19th century.  

デジャブーは、しかし、珍しくありません、さらに、対象であり続けました、科学的研究のダヨ、19世紀以来ダヨ。  

3-C. The town is more beautiful than it was in the 19th century.The town is more beautiful than it was in the 19th century.  

町は、より美しいです、そうであったよりダヨ、19世紀中にダヨ。  

4. With their overwhelming supremacy in technology, waves of colonial rule surged toward Asia in the 19th century.With their overwhelming supremacy in technology, waves of colonial rule surged toward Asia in the 19th century.  

圧倒的な技術優位を背景に、植民地支配の波は、アジアにも押し寄せました、十九世紀にダヨ。  

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