11.I’m grateful to everyone for joining in the outdoor activities. 12.While playing with his kids outdoors, the father felt very happy. 13. I wonder whether I could set down what you said just now. 14. It’s the first time that I have talked with my teacher face to face.或It was the first time that I had talked with my teacher face to face. 15.It’s no pleasure working in these conditions. 16. With a local guide leading the way, they had no difficulty walking out of the forest. 17. I find it difficult to get along with the boss. 18.It was last night that I met Mary on the way to school. 19. Having settled in a beautiful village, he settled down to his research.