These are all great and sound natural.

Your sentences are already quite natural! Here are a few minor tweaks to make them sound even more natural in everyday spoken English: 1. ✅ Natural: When I entered, the room was filled with smoke, and I could hardly breathe. - (Perfect as is!) 2. ✅ Slightly more natural: A weekend of fresh air and exercise in the countryside did wonders for Judy's mood. She really needed some fresh air. - ("Did wonders" is more common than "worked wonders" in casual speech. Also, "breathe some fresh air" is a bit redundant—just "some fresh air" works better.) 3. ✅ Perfect: I like Shakira's older songs more than her new ones. 4. ✅ Natural, but slightly smoother: I thought he was going to take my plastic plates, but he grabbed the ceramic ones instead. - (This version sounds a little more natural in casual speech.) 5. ✅ Perfect: I don't want to buy those pants; I only want these. 6. ✅ Perfect: I don't want to buy those black pants; I only want these brown ones. 7. ✅ Perfect: I don't want to buy those pants; I'm happy with the ones I'm wearing now. 8. ✅ Perfect: I went to the apple stand at the farmer's market and picked only the ones without bruises. 9. ✅ More natural flow: In my country, there are way more famous male chefs than female ones—about three times as many. - ("Way more" is more common in spoken English than "a lot more.") 10. ✅ Perfect: She used to work in a shoe store, but now she’s switched to a computer shop. Tip: Your sentences are already strong! In spoken English, we often favor shorter, more direct phrasing and natural rhythm, like using "did wonders" instead of "worked wonders" and "way more" instead of "a lot more." Keep practicing, and your fluency will keep improving!