More and more people have realized that we shouldn't _____ the ancient buildings in cities.
短语的辨析
四个选项的含义分别是：get off 下车；put off 推迟；cut down 砍伐；pull down 拆毁。结合本题语境可知，越来越多的人已经意识到了我们不应该 “拆毁” 城市里的古建筑，故答案为选项D。
She doesn't need the pen any more. She wants to _____.
句意为：她不再需要这支钢笔了。她想把它扔掉。
throw away 为 “动词+副词” 构成的短语，人称代词作宾语时必须放在 throw 和 away 中间。根据 the pen 可以判断人称代词用 it。故选B。
Two bridges _____ over the river five years ago in our city.
动词时态和语态。
考查动词时态和语态。句意：五年前，我们的城市里建起了两座桥。根据时间状语five years ago可知要用一般过去时，Two bridges和动词build之间是被动关系，故选选项C。