阅读理解。 Tom went to see his grandparents with his father. In the train Tom often put his head out of the window. His father said, 'Tom, don't put your head out of the window.' But Tom went on putting his head out of the window. His father took Tom's hat quietly and hid it behind his back and said to Tom, 'You see your hat is gone.' Tom was afraid. His father said, 'Well, whistle (吹口哨) once. Maybe your hat will come back.' Tom whistled. His father put his hat on Tom's head quickly. 'Oh! It's wonderful!' Tom laughed and said. He quickly took his father's hat and threw it out of the window. 'Now it's your turn to whistle, Dad!' he said happily. 1. Tom went to see his grandparents with his father ______. [     ] A. by bus B. by train C. by plane D. by ship 2. Tom often put ______ out of the window. [     ] A. his hat B. his father's hat C. his head D. his father's head 3. ______ and his hat was on his head. [     ] A. Tom whistled B. His father whistled C. Both of them whistled D. The conductor (售票员) whistled 4. Tom took his father's hat and ______. [     ] A. hid behind his back B. threw it out of the window C. put in under his seat D. put it on his own head 5. At last Tom's father's hat ______. [     ] A. was on Tom's head B. was on his father's head C. would come back D. was gone