同学你好，该知识点来自沪江网校《英语零基础直达大学六级【全额奖学金班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
Last week, a plane took off in the London airport.
in改成from，从……

After the plane had gainned height, a passenger pretended that he had not see the 'No Smoking' sign and threw a lighted cigarette into an air vent.
see改成过去分词seen

The plane had to return to the airport and the flight attendants told the passengers to keep quiet.
keep quiet保持安静，不如说stay calm 保持冷静

There were fire engines and ambulances to wait for the plane in the airport.
to wait改成waiting，表示正在等

Few hours later, the plane took off again.
句首加A, a few hours 几小时

祝同学学习进步~