Myparentshavearrivedatsupperti

My parents _______ have arrived at suppertime but their flight was held up due to the heavy fog.

A．will

B．can

C．must

D．should

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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

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—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

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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

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Teachers have to constantly update their knowledge in order to maintain their professional _____.

A．consequence

B．independence

C．competence

D．intelligence

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“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

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