请把以下从模块七课本抽选出来的句子补充完整，并把答案写在答题卷的相应位置上。
___________  ____________  host families, _________  _____________there may be other college students, gives her the chance to learn more about new culture.
We walked ________ two and a half hours to get there---first up a mountain to a ridge _________ _________ we had fantastic views and then down a steep path ________ the valley below.
Choose from this catalogue a really useful gift for some of the world’s poorest and ________ _________ for a better future to a community __________  _____________.