—Whyareyoulookingsoworried?—Is

—Why are you looking so worried?
—I sent an email to my son in America last week, but no reply ________.

A．was received

B．had received

C．has received

D．has been received

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A．flexible

B．concrete

C．abnormal

D．fragile

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Shortly after publication, the book became ____ because of the writer’s repeated use of the negative word "nigger" to refer to the black Americans.

A．universal

B．conventional

C．controversial

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A．irregularly

B．illegally

C．imperfectly

D．unusually

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Hearing the fire alarm, she escaped____ from the office, leaving everything behind, including those important documents.

A．in public

B．in panic

C．in relief

D．in particular

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Unlike the fossil fuels of today, biofuels are renewable sources, which mean that they will not ____ easily.

A．come out

B．break out

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