2.解析：现在分词作伴随状语。

答案：doing

I peered over.There stood Sir Henry 　2　(do)nothing less than a dance of completely unashamed ecstasy (入迷).Even when he observed my 　3　(puzzle)face staring over the wall，he did not seem 　4　(embarrass)，but shouted for me 　5　(climb)over.

“Come and see，Jan.Look！I have done it at last！”

There he was，　6　(hold) a small box of earth in his hand.I observed three tiny shoots out of it.

“And there were only three！”he said，his eyes 　7　(laugh) to heaven.

“Three what？”I asked.

“Peach stones (桃核)”，he replied.“I've always wanted to make peach stones 　8　(grow)，even since I was a child，when I used to take them home after a party.And I used to plant them，and then 　9　(forget)when I planted them.But now at last I have done it，and，what's more，I had only three stones，and there you are，one，two，three shoots，”he counted.

And Sir Henry ran off，　10　(call)for his wife to come and see his achievement-his achievement of simplicity.

语篇解读：幸福同纯朴之心有关系。仅仅因为三颗桃核发了芽，就让亨利爵士欣喜若狂，如孩童般地陶醉在成功的幸福之中。

1.解析：句型be doing sth.when...，正在做某事，这时候……。

答案：was passing

Happiness is something to do with simplicity.

20.At the age of 29，Dave was a worker，　　(live) in a small apartment near Boston and　　(wonder) what to do about his future.

解析：分析句子结构可知，空白处在句子中作状语，同时，根据and连接的动词跟其逻辑主语的关系可知，应该用动词的­ing形式。

答案：living；wondering

19.Michael's new house is like a huge palace，　　 (compare) with his old one.

解析：compare的逻辑主语是句子的主语Michael’s new house，且二者之间为动宾关系，所以应该用过去分词作状语。

答案：compared

18.With the world changing fast，we have something new　　(deal) with all by ourselves every day.

解析：不定式在这里作后置定语，修饰something，表示要做的事情。其他选项不合题意。

答案：to deal

17.They use computers to keep the traffic　　(run) smoothly.

解析：keep sth. doing表示“使某动作持续发生”。

答案：running

16.I still remember　　(take) to the Famen Temple and what I saw there.

解析：remember to do sth.记得要做某事(该事情未发生)；remember doing sth.记得做过某事(该事情已经发生)。依据后文的“what I saw there”可知这里说的是记得已经发生的事情；再者take的宾语就是句子的主语，二者间是动宾关系，用被动形式，所以选being taken。

答案：being taken

15.The play　　(produce) next month aims mainly to reflect the local culture.

解析：根据句中时间状语next month，可知这里表示将要发生的动作，所以用不定式，动词produce与主语the play之间构成动宾关系，所以用不定式的被动形式。

答案：to be produced

14.The government plans to bring in new laws　　(force)parents to take more responsibility for the education of their children.

解析：句意：政府计划制定新的法律，迫使父母对孩子的教育承担更多的责任。forcing parents to take more responsibility for the education of their children是现在分词短语作后置定语，修饰laws。

答案：forcing