My sister was against my suggestion while my brother was ______ it.
Mr Black has two sons, one of ________working as a doctor.
—Who is the man ______ by a group of students there?—A professor _____ research on physics.
— You were late again, Peter.—Sorry, I ______ to be here on time, but the traffic on the roads _____ heavy.
_____, I believe, and you will find Tom is very outgoing.
from the top of the tower ,the south foot of the mountain is a sea of trees.