My little cousin is greatly interested on science. And he does some dangerous experiments sometime. Although his parents want to encourage him to be great scientist, at times they worry about his safety. Last week, when my cousin was doing an experiment, he hurts his thumb. My aunt felt sadly and wanted him to stop from doing that experiment. However, my cousin didn’t want to give up. She said, “Many scientists got hurt when they were doing experiments, so they didn’t give up.” My aunt had to let him finish the experiments and he finally succeeded in finish it.on science→ in science
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(答案→)on science→ in science
解析：
【小题1】on science→ in science 固定搭配be interested in…对…感兴趣；形容词interested与介词in连用。
【小题2】sometime →sometimes 副词sometimes有时；有时候他做一些危险的实验。
【小题3】 be a great scientist 名词scientist是一个可数名词，前面可以用冠词a修饰，一个伟大的科学家。
【小题4】hurts his thumb →hurt his thumb 动词hurt的过去式和过去分词和原形是一样的。
【小题5】sadly→ sad 形容词sad放在系动词feel后面，构成系表结构。
【小题6】stop from doing →stop doing 固定搭配stop doing sth停止做某事。句意：想要他停止做这个实验。
【小题7】 She said→ He said 本句的主语是my cousin，是男性，故使用he。
【小题8】so they didn’t give up →but they didn’t give up 上下文之间不存在因果关系。句意：很多科学家在做实验的时候都受伤，但是他们都没有放弃。上下文之间存在着转折关系，故使用but。
【小题9】 finish the experiments→ finish the experiment 上文只提及这个实验，是一个单数名词。
【小题10】in finish→in finishing 介词in后面接动名词doing的形式。