语法填空 Li Daiyu and her cousin Liu Qian were on a trip to Canada. On the way to the station, they ___1____ (chat) about their trip. Some people have the idea ___2___ you can cross Canada in less than five days, but they forget the fact that Canada is 5,500 kilometres from coast to coast. People say Vancouver is Canada's most beautiful city, which is ____3_____ (surround) by mountains and the Pacific Ocean. ____4____ population is increasing rapidly. The coast north of Vancouver has some of the oldest and most beautiful forests in the world. It is so wet there that the trees are extremely tall, some ____5_____ (measure) over 90 metres." That afternoon aboard the train, the cousins settled down in their seats. Earlier that day, when they crossed the Rocky Mountains, they managed ____6_____ (catch)sight of some mountain goats and even a grizzly bear and an eagle. Their next stop was Calgary, which is famous for the Calgary Stampede. Cowboys who have ___7____ gift for riding wild horses come to compete in the Stampede. At school, they had learned that most Canadians live ____8____ a few hundred kilometres of the USA border, and Canada's population is only ____9____ (slight) over thirty million, but now they were amazed to see such an empty country. They went through a wheat-growing province and saw farms that covered thousands of ___10____ (acre). After dinner, they were back in an urban area, the busy port city of Thunder Bay at the top of the Great Lakes.