21.Unfortunately, when I dropped in, Doctor Li _____ for Qinghai to join in the fight against the earthquake, so we only had time for a few words
A. just left B. has just left
C. is just leaving D. was just leaving
22. Didn’t you find the manager’s name ____ in the papers?
A. signing B. signed C. to sigh D. sign
23. How I envy you____ your good luck.
A. in B. of C. to D. /
