题目内容：

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Bushfires are disasters that occur each year in many parts of the world. The worst bushfires usually involve eucalypt trees, 1. leaves burn easily. A eucalypt tree can explode in 2. ball of fire. Therefore, eucalypt forest fires can be extremely violent.

The most severe bushfire in the world is burning in south-eastern Australia and its 3. (surround) areas in this dry season. The current summer 4. (present) the perfect storm for wildfire so far. Climate change is making Australian wildfires more powerful 5. (large) due to its effects on dryness and fire weather. Australia’s climate has warmed by more than one degree Celsius over the past century. The ongoing climate change originating from human activities is virtually certain 6. (increase). This assessment of the science evidence has been repeated in countless 7. (report), including the IPCC’s report, 8. (publish) in August 2019.

Apart from being more severe, the fire seasons are becoming longer. October used to be recognized 9. the start of the fire season. But with the season starting in August, we are now facing a new 10. (real) and should pay special attention.