In 1800s, a group of adventurers(探险家) ______ on their exploring trip. Five days later, they came to what is now known as Quebec.
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.