二、单词运用 根据句子的结构和意义，在空格处填入一个恰当的单词，或者用括号中所给词的适当形式填空。
1 Vancouver is s____by mountains on the north and east and the Pacific Ocean on the west.
2 It is so wet there that the trees are e____________ tall.
3 A ______ is a place where water is calm and ships can be safe.
4 To go to Russia from China you must cross the ______.
5 The idea that there will be an earthquake t________ many people.
