15.Nowadays, many high-tech companies are competing ① one another fiercely, and every ② tries its best to develop practical new products so that they can take the lead in the market.
16.徐梦桃挑战冬奥 Xu Mengtao, a Chinese freestyle skier(自由式滑雪运动员), took part in an important ① (compete)—the Milano-Cortina 2026 Winter Olympics. She competed ② the women’s aerials final(女子空中技巧决赛). With a strong will and years of hard work, she won the gold medal.
变形: compete vi.→competition n.比赛;竞争→competitor n.竞争者→competitive adj.竞争的;好胜的

15. ①with/against ②competitor 16. ①competition ②in

17.(2026徐州一模) Stop talking and just do it! What matters most is not words but (act).
18.The charm (魅力) of the sport is not about winning but about (make) us better in life.
19.My dream is not to be rich but (contribute) to society.
20. 微写作 失败并非终点,而是成长的机会。
Failure is not the end, .
not ...but ...
不是……，而是……

17. actions/acts 18. making 19. to contribute
20. but a chance to grow（答案不唯一）