【答案】

【1】learn→learning

【2】Therefore→However

【3】at→from

【4】started→start

【5】all→both

【6】that→which

【7】去掉the或my

【8】加to

【9】model→models

【10】importantly →important

【解析】

试题分析：当我小的时候，我花了十年的时间练习小提琴。但是我不能理解“真正的音乐”。在我高中毕业后， 我的一个朋友建议我们开始学习吉他。并且我们也找到了一个吉他老师，现在吉他成了我生活中重要的一部分，我对音乐也有了更深的理解。

【1】learn→learning 考查非谓语动词。I spent more than ten years learn the violin 固定短语：spend time/ money doing sth “花钱或时间做某事”，所以用learning。

【2】Therefore→However 考查连词。Therefore, I couldn't understand "real music"．根据上下文内容可知此处前后句是转折关系，所以用However。

【3】at→from 考查介词。After I  graduated at high school, 固定短语：graduate from “从……毕业”，故用from。

【4】started→start  考查时态。a friend of mine suggested that we started to learn the guitar。suggest 当“建议”讲时，后面宾语从句的谓语动词应该用“should +v原形”，故用start。

【5】all→both  考查代词。a friend of mine suggested that we started to learn the guitar because we all thought it was cool．根据前面主句可知此处指朋友和作者两个人，用both。

【6】that→which  考查关系词。l will never forget the day on that we went to buy guitars。从结构可知the day后是介词+which/whom引导的定语从句，此处指代day所以用which，故用which。

【7】去掉the或my  考查代词。He became my the first guitar teacher．物主代词和定冠词均属于前位限定词，不能同时出现，去掉the或my。

【8】加to   考查介词。It took me such a long time choose a guitar among several wonderful model．固定句型：it takes sb some time to do sth“做某事花费某人多长时间”，所以加to 。

【9】model→models  考查单复数。It took me such a long time choose a guitar among several wonderful model。several 修饰复数名词，用models 。

【10】importantly →important考查形容词。Now the guitar is the most importantly part of my life and I practice it every day. 修饰名词part应该用形容词，用important