阅读下面短文，根据上下文填入适当的词语，或使用括号中的词语的适当形式填空。
Foreign students are valuable to the United States. Many take 1_____ in important research. Most have
to 2_____ the full costs for their education. That helps universities meet their budgets. International students
and their 3_____ put 12,000 million dollars into the American economy last year. That number is from the
Institute of International Education, based in New York.
Now, many education officials say they are concerned that 4_____ students will come to the United States
for the next school year. The officials base their concern partly on a decrease in students 5_____ (plan) to
attend intensive English programs during the summer.
The members said one reason 6_____ the expected decrease is slower and more restrictive United States
action on travel documents. 7_____ (secure) has increased since the terrorist attack of September 11,2001.
The schools also blamed the travel problems caused by the outbreak of SARS.
In recent years, 8_____ increasing number of students have come to the United States to study. The
Institute of International Education says these students represent more than four percent of all students in
American colleges and universities. 9_____ says the number of international students reached a 10_____ high
of more than 580,000 last year. The largest number came from India. Before last year largest number came
from China.
