—What are you two whispering about over there?—Oh, ________. Just small talk.
Not until the heavy snow blocked the express ____ how serious the weather was.
—Where did you see your friend? —It was in the super market ____ I was doing shopping.
Grandma will appreciate ____ if her elder sister could come back from abroad.
Statistics show that men have ___ as women do for every mile they drive.
The government has decided to _____ those shabby old buildings so as to make way for the new and wide street ___ the beautiful West Lake.