21. —You can’t enter the building without  _____ permission．

—I’ve lost  _____ permission card．

A. the，a   B. a，the     

C. 不填，the   D. 不填，不填，

22.  _______ _he works hard，I don’t mind when he will finish the experiment．

A. As soon as  B. As well as    

C. So far as   D. So long as

23.  —No more problems so far?

—  _____．All seems to be in order．

A. Yes，I think so  

B. No，I don’t think so 

C. Yes，I don’t think so

D. No，I think so