1.A boy climbed out

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1.from
2.(1）has in mind
(2) change one's mind （题中未注明为谁,所以没办法把one's变成相应的形容词性物主代词或名词所有格）
(3) make up his mind
3.B翻译：--玛丽,这是你的钢笔吗?
--不是,我的钢笔更大,（它是）一只有着蓝色笔套的钢笔.
one为不定代词,代指并相当于a pen.
4.Cfunny意思是“搞笑的/滑稽的”,用在此句不妥,排除D；
fun是不可数名词,不能用how修饰,排除A；其前也不能加a,排除B.
5.C固定搭配：go on a visit to...,意思是“进行一次到某地的参观/访问”.
6.A后句是一个让步状语从句,however = no matter how.
所以however difficult it was = no matter (how difficult it is),意思是“无论/不管它是多么地难”,而how difficult it is有点类似于感叹句型.
no matter不能单独引导没有疑问词引导的状语从句,它必须和一个疑问词连用,而且两者可以合并成一个单词：--ever,如whatever/however/wherever.
although也可以引导让步状语从句,但是其后的句子必须是陈述句,而没有疑问词引导,如although it is very difficult“尽管它很难”；
whatever = no matter what.如：Whatever you like = no matter what you like,它要求后面的从句必须缺少what这个引导词做的主语/宾语等；
however既可以单独使用,意思是“然而/但是”,类似于but,但必须用逗号和其他成分隔开；也可以等于no matter how,引导让步状语从句；
当然whatever也可以 = anything that,引导名词性从句,此处不与赘述.例如：You can't get whatever you like.= You can't get anything that you like.你不可能得到你喜欢的任何事物.