1.   Never stand over an open fire as Victorian fathers used to do.

2.   None the less, simple systems are widely used to do abinitio calculations accurate enough to answer important questions for reasonably complex molecules.

3.   I hummed to myself, something I always used to do when I wanted to smile or laugh, but thought the better of it.

4.   In this study, nude mice were used that do not possess mature T lymphocytes but do have natural killer cell activity.

5.   One girl used to do the housework, one girl used to do all the washing, she needed the water for the hot things.

6.   And just as the telephone system can be used to do many things, including placing voice calls and transmitting computer data, so can the Internet.

7.   And that money is being used to do a couple of things.

8.   And Virgil Long says the tips in Personals are like those he used doing the trick when he was a youngster.

9.   And we will listen to the news through crackling static, as I used to do the winter I lived there.