There’s no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.
Over the past decades, sea ice _____ in the Arctic as a result of global warming.
After some time in the dark cave, our eyes slowly _____ the dark.
Seldom out time to watch TV on Sunday.
Steven Hawking’s conclusion about the Black Hole is a little , but it has been accepted by most of the world.
_____ matters most in learning English is enough practice.