This is a C2 Proficiency practice exam for Part 4: Key Word Transformation. The summary below keeps the exercise understandable, linkable, and accessible outside the interactive runner.
Unless Sam's plans change over the weekend, we'll leave early on Monday morning.
[no]
Providing _______ over the weekend, we'll leave early on Monday morning.
As far as I know, Simon will be here on Thursday.
[suppose]
I've _______ be here on Thursday.
The role played by the PR company in securing the government contract was never acknowledged officially.
[official]
At no time _______ the role the PR company played securing the government contract.
Passengers are absolutely forbidden to cross the railway track.
[account]
On _______ to cross the railway track.
I have no idea why my email bounced back.
[loss]
I _______ why my email bounced back.
Felix doesn't intend to make the same mistake again.
[no]
Felix _______ the same mistake again.