The number of medical schools reached 18 in the early 1990s and ______ around that level since.
A.are remaining B.have remained
C.is remaining D.has remained
I never worried about my son while I was away because my mother ______ him.
A.drank a toast to B.played a joke on
C.kept an eye on D.made an apology to
According to Professor Johnson, we don’t have to read the book if we don’t want to, as it is ______.
A.worthwhile B.necessary C.optional D.serious
Dr. Rowan, ______ secretary resigned two weeks ago, has had to do all his own typing.
A.whose B.of whom C.of which D.which
—Shall I order a taxi for Sarah to go to the airport tonight?
—______. I’ll drive her there.
A.Have a try B.Don’t mention it C.Don’t bother D.Go ahead
______ us prepare for the exam, the teacher suggested reading through our notes.
A.To help B.Helped C.Helping D.Being helped
