:Ⅱ．单项填空（共15小题；每小题1分，满分15分）
21．The mayor
recommend that the prizes ______at once.
A.presented B.be presented C.should present D.would present
22．---The
plane is due to take off at 9;50 from the airport.
---_______we fail to arrive there in time?
A.Only if B.As if C.Even if D.What if
23．The street was named after a great man _____
his great contributions to the city.
A.in honour of
B.instead of C.in case of D.in need of
