单项选择题
What is the main difference between the two parts of the city（）
A．The colour of the buildings B．The age of the buildings C．The colour of the roofs D．The length of the streets
单项选择题 From the text, how many places have the name Valencia（）
单项选择题 Tom went out to play with his homework ______.
单项选择题 Not until ______ the whole thing to him ______ that he was wrong.
