If the building project______by the end of this month is delayed,the construction company will be fined.
In no country other than Britain, it has been said, ____ experience four seasons in the course of a single day.
They have no idea at all ____.
on the top of the mountain is an ancient tower dating back to hundreds of years ago .
No sooner _____ themselves in their seats in the theatre _______ the curtain went up.
Only when .