题目内容
According to some scientists, global warming ________ the survival of the whole human race.
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The early Spaniards established a chain of missions (传教团) to __________ the local population along the San Antonio River.
It was common practice then that when the store owners wanted to go on vacation they simply __________.
She picked up the receiver and, _____________ asking the caller to hold on, went off to tell Jack that he was wanted on the phone.
To relax himself as a little while, he rose from the computer desk, walked across the room towards the window and stretched both arms upwards and _________.
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