几道单选题~

有答案即可，如果能有简单解释再加悬赏
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．She found the room with some old tables, a blackboard and an old stove.
A．furnishing B．furnished C．to furnish D．furnish
23．Teachers should create an environment children are taught how to solve problems of learning by themselves.
A．why B．where C．which D．whose
24．A modern city has been set up in used to be a waste land 10 years ago．
A．what B．which C．that D．where
25．Follow your doctor’s advice, ______ your cough will get worse.
A. or B. and C. then D. so
26．How can you expect to pass the Oral Test of PETS _________you dare to practice in public?
A. in case B. even if C. unless D. if
27．—Sorry to have interrupted you. Please go on.