根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，并在答题卡上将该项涂黑。选项中有两项为多余选项。
May the first is an important date in the college admission process in the United States. This is the last day for high school seniors to accept or reject offers of admission in the fall. But according to a recent report, there is a great change. Acceptance rates at the top colleges this year were lower than ever. ____
These days, college applicants are applying to more colleges because online and common applications make the process easier. ____ On the other hand, deciding students for top colleges to accept can be difficult because it takes much time. Students may not like being put on waiting lists．Also, common colleges work more to getthe students they accept to accept them. Some colleges hold visiting days that offer a chance to attend classes and stay overnight. Some universities send gifts. ____
For many families, the most important thing colleges can do is show them the money, especially this year; the weak economymakes parents nervous. ____ The recent problems that spread from thehousing market to credit markets have even affected student's loans．Solately, top schools have to spare lots of money to increase their financial aidfor students.
____The Education Department expects the number of highschool graduates to start to go down. This will happen as the last of thechildren of the baby boom generation finish high school. Thenumber is not expected to start rising again until 2016.
A．Besides, top colleges are facing changesin the population.
B．What contributes to it?
C．But a mistake can be costly if ithappens.
D．But top colleges ignore them．.
E．They have international students whoknow English.
F．It can mean several acceptances tochoose from.
G．They cannot afford college as planned.
Se+2I2+4KNO3+2H2O；