题目内容：

语法填空

When people hear the word ''rat'', they may think of dirty animals that spread disease. And if you are an English learner, you may also connect the word ''rat'' with bad 1. (express). For example, calling someone a ''rat'' is 2. big insult and ''rat race'' describes a joyless, hurried way of living. So rats 3. (general) are not beloved animals either in life or the English language. But the rat trainers at the nonprofit organization, APOPO, see the animals very differently.

Based on Tanzania, APOPO trains giant rats 4. (find) landmines. Humans 5. (use) metal-searching devices to do this work for years. But rats--- it turns out--- do it better. And they also cost 6. (little) money. APOPO estimates that worldwide there are 110 million 7. (hide) explosives (爆炸物) left over from wars. These explosives are still ''live'', or able to explode. The work that APOPO does is really important in spreading the fact 8. rats are not just a pest. They really are 9. (hero) and they show us every day that they are worthy 10. that name.