________tothepapersisrestrictedtoDefenseDepartmentpersonnelonly.
A、ApplicationTo study a foreign language, __________.
We regret to ________ that it may not be possible to deal with every request.
Insomeschoolschildrenwhoprefertoreadbooksratherthan________footballbecomesocialoutcasts(被抛弃者).
Each year in the United States, many black teenagers _______ of school, either because they cannot keep up or they have to work to support their family.
________ so many people in the United States been out of work as today.
