After a thorough search, the rescue team finally brought the mountain climber back, ________.
—Sorry, sir. I'm late again.—What excuse will you __________ for yourself this time?
This box __________ all the books you need, __________ an English-Chinese dictionary.
We'd better set off or it will be dark __________ we know it.
They often use wood as fuel to __________ coal.
The policeman __________ to be reading a newspaper. In reality, he was watching the man near the window.