They tried vainly to blame us for the damage of the machine. 2. Sunrays filtered in wherever they could, driving out darkness and choking the shadows. 3. Strange enough they were the same age to the day. 4. One problem in trying to discuss the report is its sheer volume. 5. The four men huddled there and said nothing. They dare not smoke. They would not move. 6. Up to now, it is only the rocket which can propel a space vehicle. 7. Up to now, there is no fuel or chemical reaction known that could produce the sun’s heat and light. 8. A new kind of aircraft—small, cheap, pilotless—is attracting increasing attention. 9. Tried again and again, this way proved to be the most economical. 10. The chemist makes frequent use of catalysts. He adds them in small quantities to reacting materials. 11. Missing or crooked teeth may cause speech defects and unpleasant facial expressions may result. 12. Darkness fell. An explosion shook the earth. It did not shake his will to go to the front. 13. She went back home to take care of her husband. He was seriously ill. 14. They sat down in the waiting-room to do some reading. People came to and fro there.