Beijing was under an “orange” smog alert on Feb. 24, which marks the first time the second-highest warning level of a new system introduced last year________.
They talked for about an hour of things and persons _____ they remembered in the school.
It was not ______she took off the glasses ________ I realized she was a famous film star.
______ the day went on, the weather got worse.
He went home for lunch____ the clock struck twelve.
The head office of the bank is in Beijing, but it has _______ all over the country.