The first textbooks ______ for teaching English as a foreign language came out in the 16th century.
It’s a common sense _________ Canberra, ________ between Sydney and Melbourne, is the capital of Australia.
The problem of global warming is serious._________, the sea levels have _________ a little.
— Better get down to your work, Jack. —_________.
The driver was at _________ loss when _________ word came that he was forbidden to drive for speeding.
He works in Beijing but knows much about London, for he _____ there for a long time.