(   )21. — Hurry up! It’s already 7:15 now.

— Oh, take your time. The train ___________ at 8:00.

A . will leave    B. is leaving  

C. leaves        D. will have left

(   )22. Everybody present at the meeting _____ there crossing their legs.

A. sits B. sitting  C. seated D. seating

(   )23. He regrets ______ those mean words to his partner.

A. to say         B. to be saying 

C. having said   D. to be saying