—Why do you choose to work in an international travel agency.—Well,you know,English is my ________.So it is my best choice.
It has been announced that all the students ____ put on masks before going to school in case they are infected with SARS virus.
—Have you been to the Great Wall?—Perhaps not in my memory. ________, it might have been during my early childhood.
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.