21. In European countries, ______ car is ______ popular means of transportation.

A. the; a

B. a;/

C. the; the     

D. a; the

22. —Excuse me, could you please spare me a few minutes to explain this?

       —Sorry, but I must go to a meeting now.

       —______.

A. Thanks a lot

B. What a pity

C. I am sorry to hear that

D. Thanks anyway