Ⅱ.单项选择：（共15小题; 每题1分，共15分）
21. ---- Could I ask you a rather personal question? --- Sure, _______.
A. pardon me B. go ahead C. good idea D. forget it
22. The sign reads “In case of _______ fire, break the glass and press _______ red button.”
A．不填；a B．不填；the C．the; the D．a; a
23. _______ matters most in learning English is enough practice.
A. What B. Why C. Where D. Which
24. Nobody could believe what Chloe says because she is ______ changing her mind.
A. regularly B. steadily C. suddenly D. constantly
25. They have arrived at lunchtime but their flight was delayed.
A. will B. can C. must D. should
26．Stand over there _______ you’ll be able to see the oil painting better.
A. but B. till C. and D. or
27. ---Have you finished reading Jane Eyre?
