Which one of the underlined words or phrases is INCORRECT? Language teachers like explain, giving examples, and engaging…

Muhammad: Are they your children? Ahmad: No, they aren’t. they’re………

If you promise to keep a secret, I ............... You what happened.

Let's go for a coffee when ....................... writing your paper.

My uncle lived ................ the age of eighty. He died at 85.

Working in a university last year …… very interesting.