4 . 词性转换
1. ________n.挑战；艰巨任务 vt.怀疑；向……挑战→challenging adj.有挑战性的
2. ________ vt.使糊涂；使迷惑→confusing adj.难以理解的；不清楚的→confused adj.糊涂的；迷惑的
3. ________ adj.（尤指外语）流利的；熟练的→fluently adv.流利地→fluency n.流利；流畅
4. ________ vi.& vt.毕业；获得学位 n.毕业生→graduation n.毕业
5. ________ vt.建议；推荐；介绍→recommendation n.推荐；建议
6. ________ n.前进；发展 vi.前进；发展 vt.发展；促进→advanced adj.高级的；高等的；先进的
7. ________ adv.显然；明显地→obvious adj.明显的
8. ________ adj.负责的；有责任的→responsibility n.责任；义务
9. ________ n.解决办法；答案→solve vt.解决

10 . However, later when I learned from my friends that my dad defeated all competitors and won everyone’s admiration, I found that mixed in with my embarrassment was a touch of pride.

I had needed someone else to show me what I_________ in my dad. It wasn’t the fact that he’d won; it was more than that.

A．recommended

B．tolerated

C．doubted

D．appreciated