. Work on Rome’s Palatine Hill has turned up a series of discoveries, including might be the underground cave .
27. How can you expect him to make any progress ____ you never give him a chance to have a try?
26. They got married 30 years ago and never ______ in the past years.
25. The student who was caught ______ in the exam has been removed from school.
24. ---Is there any flight to New York? --- I think there ______ be, for it is snowing so heavily.
23. We have no idea at all ______the economic crisis will end.