第一节 单项填空（共15小题；每小题1分，满分15分）
21. Laid-off workers cannot afford to purchase medicines from ______ chemist when they get sick, nor do their children keep ______ healthy diet.
A. a; / B. a; a C. the ; / D. the; the
22. _________ insurance, the sickness would have caused a big problem.
A. If I hadn’t B. Having had C. If I had had D. Without
