1. That nobody saw them was a mere chance. 2. The mother insisted that her son should enter the university, (on) 3. The place looked so picturesque and cheerful that he rejoiced at the thought that he would come to live there, (of) 4. When he entered, she stood up and left the room, and even did not look at him. (without) 5. When Robert came home from the college, after he had passed his examinations, he felt very happy, (on) 6. In the darkness they were afraid that they might lose their way. (of) 7. When he reached his destination, he sent a telegram home to say that he had arrived safely, (on) 8. Thank you that you helped me. (for) 9. The new medicine may be recommended only after it is approved by the Scientific Board. 10. You will never learn your mistakes if you do not write them out. (without) 11. When the boy entered the room, he glanced curiously around, (on) 12. The patient felt much better after he had been given proper treatment. 13. Just before I left the classroom, I was approached by a fellow student who asked me to help him. 14. Looking at the man attentively, she remembered that she had seen him and spoken to him on several occasions.