20．A.encouragement

　　B．sorrow

　　C．regret

　　D．joy

　　解析：选D　joy“高兴”。根据语境可知，作者克服了害羞，成功唱完整首歌。母亲为之高兴、自豪，欣喜的眼泪夺眶而出。故D项正确。

　　Ⅱ.语法填空

　　(2016·太原一模)Young people and old people do not always agree with each other. They sometimes have different

　　__1__ (idea) about life, work and play. But in one special program in New York State, the adults and the teenagers live __2__ peace. Each summer, 200 teenagers and 50 adults live together for eight weeks as members of a special work group. Everyone __3__ (work) several hours each day. Some teenagers work in the woods or on the farms near the villages. Some learn __4__ (make) furniture and to build houses. The adults teach them these skills.

　　Everyone has several free hours every day and is __5__ (complete) free on weekends, too. During the free hours some teenagers enjoy photography or __6__ (paint). Others sit around and just talk and sing.

　　It is necessary to make rules __7__ people live together. In this program the teenagers and the adults make the rules together. When someone breaks the rules, __8__ group will discuss the problem. They will ask the questions like “Why did it happen？” __9__ “What should we do about it？”

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