题目内容：

阅读下面材料，在空白处填入适当的内容或括号内单词的正确形式。

Dinosaurs died out because of 1. unexpected incident. But wildlife today disappears or is 2. danger just because humans do harm to it. For example, tigers 3.(hunt) for fur to make carpets so that they can only live in secure reserves; grassland is destroyed without mercy so that dust storms come into being, 4. affect distant cities.

Last year, scientists 5.(see) some monkeys rubbing themselves with a certain kind of insects to protect themselves from fierce 6.(mosquito). According to the result of the inspection, they found that the insect contains a 7.(use) drug, so local farmers were employed to catch the insects. The ending was that the insects disappeared 8. (gradual) from the whole zone.

We should appreciate the natural balance and pay more attention to the 9. (important) of wildlife protection. Not until we succeed in 10. (make) wildlife live in peace can we smile in relief.