21. It is out of _________ question for him to do that for ________ fun. He is always working very hard, you know.
A. the；不填 B. a；不填 C. the; the D.不填;不填
22. No one _______ the national lab without written permission from the prime minister, according to the new lab management rule.
A. is going to enter B. will enter
C. shall enter D. might enter
23. ________ two o’clock in the morning _________ and sent home together with the taxi-driver.
A. Not until; was the journalist freed B. Until; the journalist was freed
