二、知识运用（共两节, 满分45分）
第一节：单项填空（共15小题，每小题1分，满分15分）
从每题所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21．Besides the others, there was still____third one who said he was second to reach the end.
A．a; a B．a; the C．the; the D．the; a
—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 |