The question that puzzled them is ____ they can get rid of the air pollution in the area.
| A．how is it that | B．that how | C．what is it | D．how it is that |
Teachers have to constantly update their knowledge in order to maintain their professional _____.
| A．consequence | B．independence | C．competence | D．intelligence |
“I don’t think it’s my _______ that the TV blew up. I just turned it on. That’s all.” said the boy.
| A．error | B．mistake | C．fault | D．duty |
—Look! Somebody _____ the sofa.
—Well, it wasn’t me. I didn’t do it.
| A．is cleaning | B．was cleaning |
| C．has cleaned | D．had cleaned |
The success of a government should be measured ____ the health and happiness of the people as well as the development of the economy.
| A．in face of | B．in place of | C．in terms of | D．in line with |