As the quality of the city’s air continues to give rise to ________, the residents are encouraged to drive cars less often. 

—Why didn't Mr.Smith arrive on time for the meeting?—He must have been ________ on his way here in the traffic jam.

“I don’t think it’s my _______ that the TV blew up. I just turned it on. That’s all.” said the boy.

When Richard said，“You are much more agreeable and prettier now，Joan’s face turned red at the unexpected_____.

Though your status is permanent, your identification card is         only for 20 years and has to be renewed regularly.