17. We saw him talking to some strangers on the street. A. He was seen talking to some strangers on the street. B. He was seen being talked to some strangers on the street. C. His talking was seen to some strangers on the street. D. His talking to some strangers on the street was seen by us. 18. Who wrote the novel "The Call of the Wild" ? A. Who was the novel "The Call of the Wild" written? B. By whom was the novel "The Call of the Wild" written? C. Was the novel "The Call of the Wild" written by who? D. Whom was the novel "The Call of the Wild" written? 14. It is impossible to grow flowers in your garden. A. Flowers cannot be grown in your garden. B. In your garden can't be grown by flowers. C. It's impossible for flowers being grown in your garden. D. It isn't possible in your garden flowers are grown. 5.    That airplane...... by a student pilot. B. is being flied D. is being flew A. is flying C. is being flown