【推荐1】This four-day walking tour will ___________________ through the Andes Mountains on the way to the city of Machu Picchu. (根据句意填空)

【推荐3】UNESCO是一个国际性组织，它把世界上重要的文化古迹纳入政府保护之下，以防止人们对它们造成巨大的损害。
UNESCO is an international organization, which ___________ important cultural heritage sites all over the world ___________ __________ __________ and prevents people from ___________ __________ __________ to them.

【推荐1】______ ________ ________ the factories, however, I'd like to point out that we also try to control the amount of pollution we produce. （为....辩护）（根据汉语提示完成句子）

【推荐2】这座纪念碑是为了纪念保卫国家而死去的战士。
The monument is in memory of the soldiers who died ________ ________ ________their country.