题目内容
The traffic was very heavy, ___was completely unexpected, and so we arrived after start of the program.
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My phone call to the electrician ___ as I subsequently discovered m;y wife had phoned.
Alaska found the first years of its statehood costly because it had to take over the expense of services___ previously by the federal government.
The man looked back from time to time, as if ___ who was following him.
The geocentric idea was abandoned in the 17th century, partly as a result of the writings of Copernicus___ observations made by other astronomers.
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