二．单项填空（共15小题；每小题1分，满分15分）
21. ______ hearing the news, all of us jumped with joy.
A. On B. For C. At D. Before
22. David would never forget those days ______ he spent with Chinese students in China.
A. when B. where C. which D. what
23. When he was in high school, Dave ______ the habit of making notes.
A. caused B. developed C. created D. brought
24. She decided to buy the house, the windows ______ faced the blue sea.
A. whose B. which C. of which D. that
25. Look! Your room is ______. Clean it up quickly, will you?
A. in mess B. mess C. in a mess D. on a mess
26. It’s a pity that you missed _____ the chance to go abroad for further education.
A. to give B. to be given C. giving D. being given
