从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该选项的标号涂黑。
21. In the face of _____ failure, it’s the most important to keep up _____ good state of mind.
A. /; a B. a; / C. the; / D. /; the
22. What impressed me most about the movie were the _____ filmed in New York.
A. scenery B. scenes C. sights D. views
23. My headache _____ me. I thought it was going away, but it’s getting worse and worse.
A. is killing B. kills C. was killing D. killed
