1. Making such experiments was not an easy task at that time. 2. Her main task now is making this experiment. 3. She began making this experiment yesterday. 4. He likes making such experiments. 5. I know of her making this experiment. 6. The idea of making this experiment belongs to my chief. 7. They need a unique instrument for making this experiment. 8. In making this experiment she used some new devices. 9. On making this experiment she proceeded to describe the obtained data. 10. By making a lot of experiments he gains experimental skill. 11. They cannot obtain the necessary data without making these experiments.