第一节：单项填空（共15小题，每小题1分，满分15分）
21. In China, _________ pressure to pass _________ exams gives students the impression that learning comes from textbooks.
A. /; / B. the; the C. the; / D. /; the
22. I always have so many things to ______ when I come back to the company after a trip abroad.
A. attend to B. add to C. contribute to D. appeal to
