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

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

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

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

【题目】Where does the conversation probably take place?

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

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

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

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

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