2. If a pan of oil catches fire, turn off the gas and cover the pan quickly.
catch fire：着火
The house caught fire. 房子着火了。
相关归纳：
（1）（be）on fire着火
When he arrived, he found the house was still on fire.
他到的时候，发现那幢房子还在烧。
（2）make a fire生火
They made a fire to keep warm. 他们生火取暖。
（3）start/light a fire点火
They started a fire to be seen by the rescuing team.
他们点火好让援救队看见。
