题目内容
In the Persian Gulf area, oil is found in ______and its production has been able to keep up with world demand.
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Immigration poses two main challenges for the rich world's governments. One is how to manage the inflow of ______; the other, how to integrate those who are already there.
They built the motel on the edge of a _______ village, which attracted lots of visitors from different parts of the country.
________ importance was attached to avoiding mistakes in grading the students' final examination papers.
Man has also ______ the face of the earth by draining marshes and cutting through mountains to build roads and railways.
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