—Iwonderhowmuchyouchargeforyou

—I wonder how much you charge for your services.
—The first two are free, _______the third costs ＄30.

A． while

B． until

C． when

D． before

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I have been looking for this book for months, and _____ I have found it.

A．at least

B．in no time

C．at last

D．at present

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Air and the sun's rays create much distortion, and whatever tends to _____ their influence is useful to the astronomer.

A．exclude

B．eliminate

C．extinguish

D．impose

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His job at the hospital did not pay much, so he found another _____.

A．on the rise	B．on the spot
C．on the decline	D．on the side

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Because the children keep interrupting her whenever she reads a book, she is always _____ her place.

A．loosing

B．missing

C．losing

D．looking for

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Russia's withdrawal of its experts from China did not strangle (压垮) the Chinese people; _____ it stirred up their enthusiasm for greater exertions.

A．on the other hand	B．on the contrary
C．to the contrary	D．in consequence

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