第二部分：语法和词汇知识（共15小题；每小题1分，满分15分）
11．The doctor recommended he _____ a few more days in hospital.
A. stays. B. to stay C. stay D. would stay
12. Not only should you get used to _____ under difficult conditions but also you should pay more attention to _____ your work well.
A. work; do B. working; doing C. work; doing D. working; do
