21. ____ Nobel Prize is _____ highest scientific prize there is, so we should be very proud of that.
A. /; the B. A; the C. The; / D. The; the
22. --- What do you think of the talk?
--- To tell the truth, it was _____. Many of us were soon ____ of it and began to do something else.
A. boring; tired B. bored; tiring C. bored; tired D. boring; tiring
23. The accident was really unexpected. I did try to avoid ____ the car in front of mine, but I failed.
A. to hit B. to having hit C. having hit D. hitting
