19．A.confidently B．comfortably

　　C．lonely D．independently

　　解析：选B　上文说作者一家人刚到美国的时候生活很艰苦，现在那段日子已经远去，由此可知现在生活很舒适。

　　20．A.described B．declared

　　C．proven D．realized

　　解析：选C　结合文章内容，再根据本空后的"that nothing is impossible"可知，作者的父母用行动证明了没有什么是不可能的。

　　Ⅱ.语法填空

　　It was late afternoon __1__ our car stopped in front of a school in Shuanggou, Jiangsu Province. I had been selected __2__ (head) out to this disadvantaged school. I had been looking __3__ (excite) to the opportunity to do some volunteering in China. As __4__ matter of fact, once the two­day visit was done, my co­worker and I were thinking about another trip here in the future.

　　Greeted by smiling teachers and directors, then we __5__ (direct) to a guest room for a rest. There were five of us here, __6__ (include) two girls from Canada and one from Sri Lanka.

　　The __7__ (wonder) thing about the kids is that they don't let poverty keep them down. They were all smiling upon seeing us. Some boys grabbed my hand at once to shake it. Girls stood back and took photos of the __8__ (foreign) as they pushed through a sea of screaming kids.

　　It's a tiring experience but we gained a great deal of __9__ (satisfy) from it. Whether we were in class or kicking a ball around with 300 of our closest friends, we were moved by just how eager these kids were to have access __10__ a stranger for a few short hours.

　　语篇解读：本文是一篇记叙文。作者和另外几个外国人一起来到一所贫困学校支教，这次志愿者活动给作者留下了深刻的印象。

　　1．when　主句中的"It"指时间，此处是"It be＋时间名词＋when引导的状语从句"句型。

　　2．to head　select sb. to do sth."挑选某人做某事"，故用不定式作宾语补足语。

3．excitedly　我一直激动地盼望着能有机会在中国做一些志愿者工作。空格前的looking不是系动词，而是与空格后的介词to构成look to sth."期望某事"这一搭配。故本空在句中不是作表语，而是作状语，因此填副词excitedly。