19．C

　　解析：在“我”多年的教学生涯中这件事给“我”上了最宝贵的一课，所以选C，有价值的，宝贵的。

　　20．A

　　解析：“我”很感激这件事来得早且积极。因为这件事是在作者刚当上老师不久就发生的，所以选A，早地。

　　B　(2017·江西卷)

　　“Mum, can I invite my classmate Brett over to stay tomorrow night, please? It's Friday, and we don't have any __1__. Can I, please？” Mum was sitting at the kitchen table. Dad was __2__ next to her, resting his head on his arms. Mum could __3__ that James wanted so badly to have his friend over.

　　“I'm so sorry, James，” she said.

　　“I'm never allowed to have friends come to the house? Why, Mum？” James asked sadly, almost in __4__.

　　“I know it's __5__ for you，” Mum said softly. “But I'm just worried other people might think we're a little...strange.And then they would make fun of you.”

　　“No, they wouldn't, Mum，” James protested. “We're not __6__ at all. We're just ordinary people.”

　　Mum sighed heavily. “To tell you the truth, James, my neck has been so painful that it's given me a heavy __7__. And your poor father－he doesn't feel __8__. He really needs a rest.”

　　“I can help, Mum！” James said. “__9__ I can make you and Dad feel better, can Brett come over? Please？”

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