To toe the line

It's __________to play phone in the class.

He might not like the rules but _________ just to avoid trouble.

Several Latin American countries also _______ drugs into the United States.

The teacher is going to __________ all mobile phones before passing out the exam.

Happiness isn't the _________, happiness is the journey.

As soon as I was ________, I began to have second thoughts about leaving.

My parents ___________ me from seeing Tom again.