It’s getting late. We must "be off" now. Which of the following can’t replace the underlined part?
The twin sisters look so much alike that it’s ________ impossible to tell one from the other.
Paris________ be a wonderful city but it’s not somewhere I’d like to live.
For 800 years Oxford and Cambridge universities ________ in everything from Nobel prizes to boat races.
There is a lot of evidence ________ stress is partly responsible for disease.
It is reported that the company has ________ a new household robot.