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【題目】Experiments of this kind____ in both the U.S. and Europe well before the Second World War.

【題目】They only _______ me half price for the fashionable skirt.

【題目】He is the person _______,I believe, has the ability to do this challenging job.

【題目】Never before ____________ seen anybody who can play tennis as well as Robert.

【題目】Where does the conversation probably take place?

【題目】—Are train services now back to ________ after last week’s snowstorm?

【題目】What does the man ask the woman to do?

【題目】There are some health problems that, when _______ in time, can become bigger ones later on.

【題目】American Indians ____________ about five percent of the U.S population.

【題目】Great changes _______ in his hometown in the last twenty years.