The number of medical schools reached 18 in the early 1990s and ______ around that level ever since.( )
are remaining
have remained
is remaining
has remained
Nothing could be done at the meeting, the chairman_____ absent.
Bats are surprisingly long-lived creatures, some ____________ a life span of around 20 years.
UN Secretary-General Ban Ki-moon left for Pakistan this morning, his assistant _________ him there this Friday.
______, the conference began.
Zhang Ziyi and Wang Feng, both of them ______ in the media spotlight, get romantically involved.