【正文】
______ he had visited. 3. Some of the roads were flooded, ________ made our journey more difficult. 4. The novel ________ you39。t know how 2. to plant crops or how to keep animals for their 3. food. We call them Stone Age people. Thing for 4. them were terrible and hard. Now there have still 5. some people living liked those Stone Age people. 6. They live in places that are hard reach. They do not 7. know of our invention, for they keep themselves