题目内容：

My name is Wang Kun. Ever since middle school, my sister and I    (dream) about      (take)a great bike trip. When we graduated from college, we finally got the chance to do it. It       （be） my sister       first had the idea to cycle along        Mekong River from     it begins to where it ends. The Dai live near the Lancang River, the Chinese part of the river that           (call) the Mekong River in other countries. Wang Wei soon got them interested in cycling too. She insisted that we        (find)the source of the river. She gave me a     (determine) look. Once she has made up her mind, nothing can change it. Finally, I had to give