How to use "assuming" in a sentence

'You will have them,' said Fantine, assuming that she was talking to Mme Thenardiers husband

If he failed to stop Stryker and the Evans woman, his dream of assuming the director's chair in a few years would never become a reality.

The book you now hold in your hands - assuming that you are not quadridexterous and holding it with your feet - was the second book I wrote under the pen name Leigh Nichols