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读一读,填一填。 Old Peter likes travelling. He travelled to a lot of places in the world. One summer he took his son, little Peter to London. They travelled by train. It was the first time that little Peter took a train. He was so excite -d that he sometimes put his head out of the window. He wanted to see the beautiful things along the railwa -y. Old Peter said,' What are you doing, my son? Don't put your head out of the window. It's dangerous to do that.' Then little Peter felt a little unhappy. 1. _____ likes travelling. 2. Little Peter travelled by train for _____. 3. Little Peter sometimes _____ to see outside. 4. It's _____ to put his head out of the window.