A.Taking an exam.
B.Drawing graphs.
C.Giving presentations.
D.Having a class discussion.
A.Fall.
B.Winter.
C.Spring.
D.Summer.
A.Less than 10 minutes.
B.About 20 minutes.
C.45 minutes.
D.Over an hour.
A.A matter of work.
B.A matter of life or death.
C.A matter of concern.
D.A matter of course.