It’s difficult for college students to have a train seat during holidays, so they are advised to make seat ________ well in advance.
28. It is suggested that the project ______ until all the preparations have been made.
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.