第一节：单项填空(共15小题；每小题1分，满分15分)
21.--We've cross-checked the data collected from the Internet.
--Good. Anyway,_______.
A. you can't be careful enough B. you are careful enough
C. you can't be so careless D. you are never careless enough
22. --Some people believe that English is one of the most important subjects for us students.
--It _______ . But things seem to be changing in recent years.
A. used to B. used to be C. used to do D. was used to be
23. --My goodness, you crossed the double yellow line!
--I tried not to, but _______ . The car in front changed lane suddenly.
A. in time B. in case c. in need D. in vain
24.All parties made their final efforts, _______ to reach a compromise of some kind.
A. seeking B. to seek C . to have sought D. having sought
25.Liu opened her mouth as if _______ something to Calaf, hut gave up seeing his passionate
eyes locked on Turandot.
