6. --l had a really good weekend at my uncle's.
--_____.
A. Oh. that's very nice of you
B. Congratulations
C. It's a pleasure
D. Oh. I'm glad to hear that
7.--I,m going to the post office.
--_____you're there. can you get me some stamps?
A. As B. While C. Because D. If
8. Paper money was in _____use in China when Marco Polo visited tbe country in_____thirteenth century.
A.the;不填 B.the;the
C.不填;the D.不填;不填