--Who is the old man talking with your teacher? ---I don’t know. I him before.
If you can’t understand these sentences, your constant lack of handing in homework ____.
We all ____ that the construction of the bridge will be finished next term.
____ to cholera, the people became _______.
As we know, the UK _____ four parts, England, Wales, Scotland and Northern Ireland.
Dickens World, a theme park in the UK, makes the life, stories and characters of Charles Dickens _______.