He learned_(ride)a bike when he was nine years old

He learned it from a world-famous musician called Beethoven = He learned it from a musician
called Beethoven （ who is ) famous around the world.
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选择A 第一个空教他历史 动词后面用宾格,第二个是他自学 主语和宾语一致宾语用反身代词 所以填himself

C

考查宾语从句的连接词。________ everyone needed friendship and ________self confidence is important.是两个并列的宾从，从句都不缺成分，所以用that引导，第一个that可以省略，第二个不可少，所以选C。