So suddenly_______that the animals in the zoo looked very frightened during the total solar eclipse.
The economic impact study was conducted by a group of _______ selected MBA students at the University of Kansas.
_______ any other species, human populations are shaped by the usual forces of natural selection, like famine, disease or climate.
— I’m terribly sorry to keep you waiting for so long. — _______.
It’s extremely dangerous for the drivers to _______ speed as the traffic lights are changing.
The government is now trying to provide _______ health benefits to all citizens in China.