前面的几个回答吓死我了。有的和你书本上的有出入，但绝对是英语。只是担心老师看了会……
1 他哥哥成功地阻止他放弃那份薪水不高的工作。（succeed in/,dissuade...from）
His brother succeeded in persuading him from giving up the low-salary job.
2 他独自一人花了两星期时间完成了这项调查（investigation）
He spent two weeks in completing the investigation all by himself.
3 除非他自己意识到这一危险，否则没有人能够阻止他干这事
Unless he realizes it is dangerous to do that,nobody else can prevent him.
4 如果你想取得好成绩，就不能过分依赖别人的帮助
If you want to get good results,do not rely on others too much.
5 尽管困难重重，我们仍决心执行我们的计划
Although there is a lot of difficulties,we still decide to carry out our plan.
6 如果没有你们的帮助和支持，我们不可能提前完成工作（without）
Without your help and support,we could not have finished work ahead of schedule.
7 我把那些书寄给她已有一个多星期了（It has been/is ...since）
It is more than a week since I sent her those books.
8 我建议我们开会讨论一下这个问题，看看我们是否能拿出更好的解决方法（propose/come up with）
I porpose we have a meeting to discuss the problem,and find out whether we could come up with a better solution.
9 众所周知，在速度和舒适方面，飞机和轮船大不相同(It is well known that...)
It is well known that plane is quite different from ship in speed and comfort .
10、在这而生活了许多年，她已渐渐熟悉这座城市了（come to）
As she has lived in the city for many years, she has come to know it.
11 让我们惊讶的是，那个陌生人竟然是母亲的大学同学(turn out)
To our astonishment,the stranger turned out to be my mother''s university classmate.
12 由于疏忽，他在工作中受伤了（result in）
Negligence resulted in his injure.
13 更重要的是，你们应具有良好的学习习惯
It is more important that you get good study habits.
14 萨姆半年前曾在我厂任短期顾问
Sam worked as a consultant in our factory for a short time half a year ago.
15、约翰是班上年龄最小的学生，但他在各门功课上都与其他学生并驾齐驱（keep up with）
John is the youngest student in the class,but he keeps up with others in all of the subjects.
16 一个顾问有责任对那些决策者提合理的建议（be responsible for）
A consultant is responsible for making reasonable suggestions for the decision makers.
17、在葬礼上这位战士的一个朋友无法控制自己的感情，放声大哭起来（hold oneself in）
In the funeral, one of the soldier''s friends could not hold himself in bursting out into tears.
18 在会上，他就准备解决这个问题的方法做了十分钟的发言
He made a speech for ten minutes on the solution to the problem.
19 认为计算机最终会代替人脑是愚蠢的（take the place of）
It is stupid to think computer will take place of human brain.
20、不要不懂装懂（pretend）
Do not pretend knowing what you don''t know .