49 Most Americans don't stay put these days because

29. She was particularly concerned to sequre these monies金钱for her children ( )her husband remarrying after her death.

28. Every titne she talked about being rejected in her hunt for a job, she seemed on the ( ) of tears, and I would quickly switch the conversation to another topic.

27. In those days, divorce under any circumstances was socially unacceptable and there was great ( )in the family who went through it.

26. In this introduction we have diagnosed some of the causes of the illness and, in the following chapters, we will draw attention to its various unpleasant( ).

25.The blizzard暴风雪moved scyith,turning into an icy rain that ( )the airports for three days.

24. Unless we can find a way to ( )nature and then invest in protecting it, our basic lifersupport systems, are going to collapse.

23. During one particularly ( )moment in my career, a senior colleague of mine said to me,“If you follow your dreams, the money will come. Follow the money, and you'll lose your dreams."

22. Whatever the decision is, I would like you to know that your department is my first choice and I ( )it a great honor if I could study in your department.

21. Just as I started to think that I was never going to get well, the illness began to( ).

20. The first lesson I learned as a newcomer for the company was never to( ) degree of difficulty I would face in career advancement.