The door burst open and________, shouting with anger.
| A．rushed in a crowd | B．in rushing a crowd |
| C．in rushed a crowd | D．in a crowd did rush |
It has been announced that all the students ____ put on masks before going to school in case they are infected with SARS virus.
| A．shall | B．will | C．need | D．may |
—Have you been to the Great Wall?
—Perhaps not in my memory. ________, it might have been during my early childhood.
| A．If any | B．If so | C．If ever | D．If not |
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 |