Nobody noticed the thief slip into the house because the lights happened to_______.
He was about to tell me the secret___________someone called him by his name.
He used to make a living_________playing music on festivals. Now he makes shoes__________ his own hands.
We can’t continue to pretend that the problem of pollution doesn’t___________in this city.
We must do whatever we can to ______the river from being polluted any more.
We should try our best to___________ those people after the disaster.