I was about to leave __________ someone knocked at the door.
24.The students were ____ over the ____ problem, listening to the teacher with a ____ expression on their faces.
23.The country life he was used to ____ greatly since 1992.
22. This book ________ 20 articles, ________ three written by his daughter.
第二部分选择填空(共20小题;每小题1分,满分20分)21.—Have you seen _______ pen? I left it here this morning.—Is it _______ black one? I think I saw it somewhere.
35.The highest award was given to Anna, who_________so hard on the project for years, and at last her efforts paid off.