现在，故应用现在完成进行时。

　　5．Which is mentioned above, they have succeeded in solving many problems with the new theory.

　　___________________________________________________

　　答案：Which→As　该句中从句为as引导的非限制性定语从句。which引导的非限制性定语从句不能置于句首。As is mentioned above "正如上面所提到的那样"。

　　Ⅲ.语法填空

　　One day, I had an argument with my mother. I was so angry that I ran away from home, __1__ (think) I'd never go back again.

　　While walking on the street, I saw a little girl in front of __2__ flower shop. She looked very sad. __3__ I approached, I found there were tears in her eyes. I was sad too, so I walked to her and asked her why she was sobbing. She said she wanted to buy a red rose for her mother, __4__ she didn't have enough money. Since a rose didn't cost much, I decided to buy her a rose. I __5__(buy) the little girl her rose. But she still looked sad. When I asked her __6__ , she said, "Roses are my mother's favorite flowers. But she can no longer see __7__now as she has died." As she was saying that, more tears appeared in her eyes.

　　I felt terrible hearing that. I thought __8__my mother. I never thought my mother would leave me one day. Realizing that she might leave me one day made me feel very __9__ (guilt) about having argued with her. I __10__ (immediate) went back and apologized to her. I haven't argued with her ever since.

　　1．________2.________3.________4.________5.________ 　6.________7.________ 8.________ 9.________10.________

　　篇章导读：本文是一篇夹叙夹议文。作者在一次偶然的经历中意识到妈妈有一天可能会离开他，作者从此不再跟妈妈争吵了。

　　1．thinking考查非谓语动词。分析句子结构可知，I与think之间是逻辑上的主谓关系，表主动，故填think的现在分词形式。

2．a考查冠词。此处泛指"一个花店"，故用不定冠词a。