21.English has become a communication _______ for people from different countries.
22.During the eight years war, many people _______ their blood for their country.
23.You have greatly _______us. What you have done is not what you told us about several weeks ago.
24.Before you begin writing your paper, please write ------__________ first. Then we can have a better idea about what you are going to talk about.
25.If you ask why I plan to study in the United States, the only answer is that it is a _______ for me .
26.A _______ political and economic situation is very important for the development of any country.
27.The financial support is decided not only according to your GRE score, but also according to your _______ in college.
28.The World Trade Center is often called a _______ Building, because it is made up of two identical buildings.
29.It is impossible for us to _______ such a difficult task within the limited time.
30.Please do not _______ when somebody else is talking.
21.D 22.A 23.A 24.D 25.D
26.B 27.A 28.C 29.C 30.C