一、语法填空(根据课文内容、依据语法规则完成下面短文）
Wang Kun and his sister Wang Wei had dreamed about 1________ (take) a great bike trip. They decided to cycle 2________ the entire Mekong River from 3________ it begins to where it ends. Wang Wei 4________ (insist) that they start from Qinghai where the river begins in order to see all of the Mekong River. Wang Kun said it 5________ (be) very difficult, because their journey would begin at an altitude of more than 5,000 metres. But Wang Wei refused to change her mind, 6________ (say) that it would be 7________ interesting experience.
