第二部分：单项填空 （共20小题；每小题0.5分,满分10分）
16. Enjoying the wonderful view on ______ board the plane was really ______ unforgettable experience. It made a deep impression on me.
A. /;the B. the; an C. /;an D. the;/
17．______ to her busy work, Lin Qiaozhi care little about any other things.
A. Devoting B. Devoted C. Having devoted D. To devote
18. The squirrel was so lucky that it just missed ______.
A. to be caught B. to be catching C. being caught D. to catch
19. It was ______ computer games that cost the boy a lot of time ______ he ought to have spent on his lessons.
