11. A man escaped from the prison last night. It was a long time _______ the guards discovered what had happened.
A. before B. until
C. since D. when
12. A man has to make _______ for his old age by putting aside enough money to live on when old.
A. supply B. assurance
C. provision D. adjustment
13. A neat letter improves your chances of a favorable _______.
A. circumstance B. request
C. reception D. response
14. A new technique _______, the yields as a whole increased by 20 percent.
A. working out B. having worked out
C. having been worked out D. to have been worked out
15. A person who makes wise decisions has _______.
A. a good brain B. a good intention
C. good judgement D. good imagination
11. A【句意】昨晚有人越狱，好长时间后，狱警才知道发生了什么事。
【解析】“It's…before”句型表示“(……之后)才……”之意，如：It was several weeks before I got a decent night's rest.几星期以后我才得以好好地睡了一夜。故A符合题意。until意为“直到……为止”，在否定句中多译为“直到……才”，该词一般不用在“it is…until”(肯定)句型中,如：They talked on until one o'clock In the morning.他们一直谈到凌晨一点钟。“It is(has been)…since”句型表示“自……以来已有……时间了”，例如：It has been only twenty five years since television came to control American free time.电视开始主宰美国人的空闲时间，至今也不过才25年。when通常表示“在…… 时”，用在本题不符合题意。
12. C【句意】人必须为他的老年做准备，预备足够的钱以备年老时用。
【解析】provision意为“准备，预备”，如：They spent all their money and made no provision for the future.他们把钱都用光了，未留日后需用。assurance意为“保证”，如：He gave me his assurance that he would come.他向我保证他会来的。supply作“储备.供应”讲，常与介词of连用，如：we have a good supply of water here.我们这里的水供应充足。adjustment意为“调整，调节”，如：He is making some adjustments to his plan.他正调整他的计划。
13. D【句意】一封漂亮的信可以提高回信的机率。
【解析】response意为“回答，答复”，符合题合，如：My letter of inquiry brought no response.我的询问信始终未得到回音。circumstance常用复数，意为“情形，环境，状况”，如：Don’judge the crime until you know the circumstances.在你未了解一切情况之前，勿对罪行下判断。request作“请求，要求”讲，如：The professor gave us a lecture at our request.应我们的要求，教授给我们讲了一课。reception意为“接待，招待会”，如: We have a special room for the reception of patients.我们为病人设了专门的接待室。
14. C【句意】新技术的使用使得去年的产量增加了百分之二十。
【解析】根据句子结构，我们可以看出这里应使用独立分词结构。故D错误。由于动词work out和a new technique是逻辑动宾关系，故此处只能使用过去分词的独立结构或使用被动语态的现在分词独立结构，例如：Machines having been used，People do more work with less energy.由于使用了机器，人们就能用较少的力气，干较多的工作。
15. C【句意】一个做出明智决定的人一定有很强的判断力。
【解析】a good brain意为“很聪明”，如：He has such a good brain that he is quick at learning anything.他很聪明，学什么都快。a good intention意为“好的意图”，good imagination意思是“丰富的想像力”，而good judgement则用来表了“判断力强”，如：He is a man of good judgement.他是一个判断力很强的人。根据句子结构及题意可知C为正确答案。
