Mr Black has two sons, one of ________working as a doctor.
A. them B. who C. whom D. whose
—Who is the man ______ by a group of students there?
—A professor _____ research on physics.
A. followed; did B. following; did
C. followed; doing D. following; doing
— You were late again, Peter.
—Sorry, I ______ to be here on time, but the traffic on the roads _____ heavy.
A. wanted; was B. had wanted; was
C. wanted; would have been D. had wanted; would have been
_____, I believe, and you will find Tom is very outgoing．
A．Having a talk with the student B．Given a talk with the student
C．If you have a talk with the student D．One talk with the student
from the top of the tower ,the south foot of the mountain is a sea of trees.
A. Seen B. Seeing C. Having seen D. To see
—I wonder why Susan looks worried today.
—I’m not sure, but she _____a small accident driving here.
A. could have B. might have C. might have had D. must have had
