二、单项选择(每小题1分，共15分)
21 .In Dali Mr Green was so struck by the beauty of _____nature that he stayed for _____third week.
A. the ; the B. the ; a C. 不填；the D. 不填；a
22. ——Did you stay up very late last night?
——No，It was not 10 o’clock yet ____I went to bed.
A . when B. until C. that D. while
23 . If I remember correctly， _______was ten years ago that your brother went to Canada.
A. this B. which C. as D. it
24. ----If a new difficulty ______, what would we do ?
-----Don’t hesitate to turn to us .
A. is arisen B. will be arisen C. arose D. would arise
25. Your coat is identical _____mine. No wonder you took it ____mistake.
A. to ; for B. as ; by C. as ; for D. to ; by
26. I visite Zhangjiajie during the summer vacation .It’s a pleasant trip, ____I’ll never forget.
A. one B. what C. it D.that
27. -----It seems a little ugly to me .
-----______, I think it’s rather beautiful.
A .In other words B. On the other hand
C. On the contrary D. In a nutshell
