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1. There were numerous factors the engine designer had to consider before he found the best compromise between efficient fuel burning and good breathing.

2. Five-stroke engines first appeared when the fifth cycle, called refrigeration, was added by Delautour.

3. When she asked me if I heard those noises and rattles, I told her I believed it was fuel detonation.

4. It was reported that in order to demonstrate the new model's efficiency the company organised a test-drive show.

5. When my friend informed me that he was going to check the engine operation, I asked him if he needed any help.

6. On the road we had only a few emergency tools we brought in the luggage rack.

7. When she said she wanted to take part in the races, I wondered if she considered it to be safe.

8. The sales agent evidently disliked that the customers asked him plenty of questions about the car history.

9. He asked me if the driving test was difficult. I said that I thought so.

10. Everybody knew that after they improved their attitude towards the work, they would not fail the test.

11. The air was compressed to such a degree that a temperature far above the ignition point of the fuel was obtained.

12. He understood that he would spoil the work if he didn't stop the spark generation in time.