请认真阅读下面短文，并根据各题所给首字母的提示，写出一个合适的英语单词完整、正确的形式，使短文通顺。
About 160 years ago, the Austrian scientist Mendel did many important experiments (实验) with pea plants. After eight years of careful r 21 , he finally discovered the basic rules of inheritance (遗传). This helped him make great p 22 in the study of biology. But for the next hundred years, people still didn’t know why some pea plants were tall while some were short.
Then, amazing news came! A group of international scientists worked t 23 and found more. This team was led by two great scientists, Cheng Shifeng from China and Noel Ellis from the UK. They shared information from their experiments, talked about problems, and tried different ways to s 24 these problems.
The scientists used modern scientific tools to look at Mendel’s 1865 experiments again. They wanted to learn more about the genetic (基因的) changes. So, after 2019, they grew more than 700 k 25 of peas from Britain in China. They built special greenhouses to study the plants. Finally, they discovered the changes in pea genetics. What a great s 26 they achieved!
Cheng Shifeng, the group’s lead scientist said, “Mendel found out the rules of inheritance many years ago, but he didn’t know what a gene was and h 27 it worked. Now we can see the changes clearly from the study.”
Scientists once tried to e 28 why some pods (豆荚) are green and others yellow. This study has found out some secrets about genes in DNA．The genes can c 29 the colours of peas.
This study shows that with modern scientific tools, nowadays we can understand the genetic world b 30 . It’s a great example of how we keep working out the mysteries of nature.
【参考答案】
21．(r)esearch/(r)esearches
22．(p)rogress
23．(t)ogether
24．(s)olve
25．(k)inds
26．(s)uccess
27．(h)ow
28．(e)xplain/(e)xplore
29．(c)ontrol
30．(b)etter
【导语】本文介绍了科学家们通过现代技术重新研究孟德尔的遗传实验，揭示了豌豆基因变化的秘密，并展示了科学探索如何帮助我们更好地理解自然规律。
21．句意：经过八年的仔细研究，他终于发现了遗传的基本规律。根据“Mendel did many important experiments (实验) with pea plants”和“discovered the basic rules of inheritance (遗传)”可知，经过八年仔细的研究，最终发现了遗传的规律；research“研究”，名词，此处既可以泛指“研究”这一抽象概念，也可指代具体的研究项目或成果。故填(r)esearch/(r)esearches。
22．句意：这使他在生物学的研究上取得了很大的进步。make great progress“取得巨大进步”，固定短语。故填(p)rogress。
23．句意：一组国际科学家共同努力，发现了更多。根据“A group of international scientists”可知，一组国际科学家一起工作并发现了更多（成果）；结合首字母提示，together“一起”，符合语境。故填(t)ogether。
24．句意：他们从实验中分享信息，讨论问题，并尝试不同的方法来解决这些问题。根据“tried different ways to ... these problems”可知，尝试用不同的方法来解决问题，solve“解决”，动词，to后接动词原形。故填(s)olve。
25．句意：因此，2019年之后，他们在中国种植了700多种来自英国的豌豆。根据“more than 700 ... of peas”及首字母可知，此处表示700多种豌豆，kind的复数kinds符合语境。故填(k)inds。
26．句意：他们取得了多么大的成功啊！根据“they discovered the changes in pea genetics.”可知，他们发现了豌豆基因的变化，获得了巨大的成功；a后接名词，success“成功”，符合语境。故填(s)uccess。
27．句意：孟德尔多年前就发现了遗传规律，但他不知道基因是什么，也不知道它是如何工作的。根据“he didn’t know what a gene was and .... it worked”可知，孟德尔不知道基因是如何工作的，how“如何”，符合语境。故填(h)ow。
28．句意：科学家们曾经试图解释/探索为什么有些豆荚是绿色的，有些是黄色的。根据“why some pods (豆荚) are green and others yellow”可知，为什么有些豆荚是绿色的，有些是黄色的，这个问题科学家们曾经试图解释/探索，explain“解释”/explore“探索”，符合语境，to后接动词原形。故填(e)xplain/(e)xplore。
29．句意：这些基因可以控制豌豆的颜色。根据“The genes can ... the colours of peas.”及首字母可知，基因可以控制豌豆的颜色，control“控制”，动词，情态动词can后接动词原形。故填(c)ontrol。
30．句意：这项研究表明，借助现代科学工具，如今我们可以更好地了解基因世界。根据“with modern scientific tools, nowadays we can understand the genetic world ”可知，借助现代科学工具，如今我们能更好地理解基因世界；better“更好”，修饰动词understand。故填(b)etter。
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