—What’s wrong with you?—I can’t decide ______ next.
—Do you know who invented Chinese chess?—Sorry. I don’t know. Let’s ______ the Internet ______ .
—Please say something about Zheng He.—Oh! He is the Ming dynasty explorer of ______ all the Chinese are proud.
The People’s Republic of China was ______ on October 1st, 1949.
do you write to your pen-friend?— Once a week.
It was late _______the night of october20,1999.