2.He was disabled from birth, but he never felt frustrated, __（ 也从未屈服于任何困难 ）.

　　3.The little boy next door has been beating his drum for a whole morning, which got on my nerves so much __（ 以至于我无法集中注意力学习 ）.

　　4.The scientist tried to convince us that a tiger would not attack us __（ 除非它走途无路 ）.

　　5.The nation ' s population continues to rise ______ （ 以每年 1200 万人的速度 ）

　　6.（如果你设法与Smith先生取得联系）___the problem will be solved easily because he is an expert in this field.

　　7.The problem lies in how people look at those students ___（专心追求知识的）.

　　8.On Children's Day, kids ___有资格免费进入） to all the city parks.

　　9.The restaurant next door serves good food, but the one across the street is much better ___（就服务而言）.

　　10.___（每当天气不好时）, he takes whatever umbrella he can find.

　　11.Animal experiments will continue to be necessary to resolve existing medical problems ___（ 尽管一些人公开反对 ）.

　　12.Professor Clark was a bit strict with us, ____（ 但我们确实从他那里学到了很多 ）.

　　13.The more you explain, ___（ 我愈糊涂 ）.

　　14. He has done so much for the poor in his community that ___（ 再怎么赞扬他都不过分 ）.

　　15.Since my childhood I have found that __（ 没有什么比读书对我更有吸引力 ）