人牺牲来改变世界。

【7题详解】

考查介词。句意：每天，他乘火车去红山帮助三个老人做家务和购物。固定搭配：by train"乘火车"。故填by。

【8题详解】

考查时态。句意：到目前为止，詹姆斯和他的朋友们组织了一群年轻的志愿者。so far"到目前为止"，后面的主句谓语动词要求使用现在完成时。故填have formed。

【9题详解】

考查定语从句。句意：到目前为止，詹姆斯和他的朋友们组织了一群年轻的志愿者去寻找那些需要帮助的人。此处为定语从句，先行词是people，关系词在从句中做主语，应使用关系代词who/that引导。故填who/that。

【10题详解】

考查不定式。句意：他们的主要目标是通过个人牺牲来改变世界。此处动作做表语，且表示目的、将来，应使用不定式形式。故填to make。

第二节 完形填空（共20小题；每小题1.5分，共30分）

阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项，并在答题纸上将该项涂黑。

　　The universe has a way of sending help from even the most unlikely of places.

　　When Tony received a wrong-number message on his mobile phone, he could have just ___11___ it. Instead, he gathered five of his six children and ___12___ a picture to send to Syd, the girl on the other end of line, just to give her a little ___13___ However, he had no idea that replying to this random message would ___14___ his family's life.

　　The message was from Syd, who was dress shopping when she decided to get a second ___15___. So she took a picture of herself in the new dress that she had chosen and sent the message to who she thought was her friend.

　　Tony sent her a message ___16___ right away, but he also wanted to let her know that her pretty picture hadn't ended up in the ___17___ hands, so he included a picture of his kids giving a big thumbs-up. "I figured that the children's ___18___ would be far better than some middle-aged man!"

Syd's friend Mandi was deeply touched by the ___19___ that she posted it online, where it