Levi Strauss was born in 1829 in Germany.He was the fifth of six children.In 1845，his father died.All six children decided 【小题1】 (go) to the United States.Strauss went to the southeastern part of the US.For eight years，he walked along the country roads 【小题2】 (sell) dry goods from door to door—just like his father in Germany.
In 1853，Strauss decided to move to San Francisco，【小题3】 thousands of people were looking for gold. 【小题4】 his way to California，Strauss sold almost all of his dry goods.He had only one thing【小题5】 (leave)some canvas (帆布)．
In California，Strauss tried to sell the canvas to the gold miners.He said they could make tents from the canvas.But they weren’t 【小题6】 (interest) in canvas for tents.Strauss didn’t know 【小题7】 to do with the canvas.Before long Strauss found the miners needed new pants.There were holes in their pants 【小题8】 the cloth wasn’t strong.He decided to make the canvas 【小题9】 pants.They called them “Levi’s”．Later, Strauss stopped using canvas and used a different cloth.It was a heavy cotton cloth—the same kind people wear today.
Levi Strauss died in 1902.He never married and left money to his nephews.He left the world much more—the jeans 【小题10】 so many people wear.to go
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(答案→)to go
解析：
【小题1】to go [decide to do sth.“决定做某事”，为固定用法。]
【小题2】selling [动词sell与主语he为主动关系，故用其现在分词形式作伴随状语。]
【小题3】where [where引导非限制性定语从句，相当于in which，在从句中作状语。]
【小题4】On [on one’s way to...“在去……的路上”，为固定搭配。]
【小题5】left [动词leave与宾语one thing之间为动宾关系，故用其过去分词形式作补语。]
【小题6】interested [be interested in...“对……感兴趣”。]
【小题7】what [what引导宾语从句，且在从句中作动词do的宾语。]
【小题8】because [根据文意可知，此处为因果关系。因为布不结实，所以他们的裤子上有窟窿。]
【小题9】into [make...into...“把……制成……”，为固定搭配。]
【小题10】that/which [此处that/which引导定语从句，修饰the jeans，且在从句中作wear的宾语。]