7．解析：will改为would。考查一般过去时。由that day及主句的一般过去时可知，宾语从句也应用一般过去时。故将will改为would。
8．解析：删除was。考查动词语态。根据语境可知，句子主语the driver和谓语动词offered构成逻辑上的主谓关系。故删除was。
9．解析：broke改为broken。考查过去分词用作形容词，作宾补。
10．解析：is改为was。考查过去将来时。句意：刚才，乔安娜准备去给她的儿子开门时电话响了。由rang和Just now可知，主句谓语动词动作为从过去某一点时间看将要发生的动作，故应用过去将来时。
Ⅳ.短文改错
In the past，we usually go shopping in stores，supermarkets and malls.And nowadays，shopping online has become an important part of many people's life.
According to a study on online shopping in China, the number of online shopping in China has already come 2.67 billion，only second to that in America. It is show that most of them are people aged from 18 to 35. Besides, many women than men prefer online shopping.
There are various reason for people's preference for online shopping. First of all, it's advantage is to spare much time and trouble in shopping outside. In an addition, various goods attract people, especial young people who are more particular about styles and fashions. Last but not least, online shopping has a greater advantage in price, which can attracted online shoppers.
答案：
5