It’s reported that workers on London’s underground train network will go on strike（罢工）in ________ with colleagues losing their jobs at ticket offices. 

I listened to Dr. Johnson’s lecture about biology, but I failed to get its key ____.

There was a            reaction from the public when the singer was sent to prison last week.

 –What’s the matter, doctor? --Nothing serious. Take the medicine according to the ______.

 I’m trying to break the _________ of talking in class.