These trousers are dirty and wet — I’ll change into my _____.
The question that puzzled them is ____ they can get rid of the air pollution in the area.
Teachers have to constantly update their knowledge in order to maintain their professional _____.
“I don’t think it’s my _______ that the TV blew up. I just turned it on. That’s all.” said the boy.
—Look! Somebody _____ the sofa.—Well, it wasn’t me. I didn’t do it.
The success of a government should be measured ____ the health and happiness of the people as well as the development of the economy.