2 . I was in the middle of the Amazon with my wife, a medical researcher there. We did not speak the local language, did not know the customs, and even did not entirely _________ the food. We could not have felt more _________.

Then one perfect Amazonian evening, with monkeys calling from beyond the village green, we played soccer. _________ darkness came over the field and the match ended, the goal keeper, Juan walked over to me and said in a matter-of-fact way, “In your home, do you have a moon too? ” I was surprised. After I _________ to Juan that yes I felt a sort of awe at the _________ that existed in his world. where the unknown and undiscovered was _________ and amazing. Anything was possible.

In our society, we know that Earth has only one moon. I can, from my computer at home, _________ satellite images of Juan’s village. There are no more moons to search for, little _________ to discover. Yet, as an ant biologist, I knew that much in the world of insects remains unknown. How much, though? How _________ are we? The question of what we know and do not know __________ bother me.

I began to __________ newspaper articles about new species, and on and on they __________. In looking into the __________ of biological discovery, I also began to find a collection of scientists, who very often focused on common phenomena more to the point of exhaustion (筋疲力尽), and even at the risk of the __________ of their peers.

We used to think that nothing lived deeper than six hundred meters. Yet, when something new __________ more often than not, we do not even know its name.