题目内容：
根据下列文章,请回答题。Migrant (移民) WorkersIn the past twenty years, there has been an increasing tendency for workers to move from one country to another. While some countries have restricted (限制) most________. (1) to local people, others have attracted and welcomed migrant workers. This is particularly the case in the Middle East,________ (2) increased oil incomes have enabled many countries to call in outsiders to improve local facilities (设施). Thus the Middle East has attracted oil-workers ________(3) the U.S.A. and Europe. It has also brought in workers from many other countries,________ (4) South Korea and Japan.In view of the difficult living and working________(5) in the Middle East, it is not surprising that the pay is high to attract suitable workers. Many engineers and technicians can ________(6) at least twice as much money in the Middle East as they can in their own country, and this is a major________(7).
Sometimes a disadvantage has a compensating (补偿的) advantage. For example, the________ (8) living conditions often lead to increased friendship when workers have to________ (9) on each other for safety and comfort. In a similar way, many migrant workers can save large sums of money partly because of the________(10) of entertainment (娱乐) facilities. The work is often complex and full of problems but this merely presents greater challenge to engineers who prefer to find solutions to problems rather than do________(11) work in their home country.
One major problem which ________ (12) migrant workers in the Middle East is that their jobs are temporary ones. They are nearly always on ________.(13), so it is not easy for them to plan ahead with great confidence. This is to be________ (14) since no country welcomes a large number of foreign workers as permanent residents. In any________(15), migrant workers accept this disadvantage, along with others, because of the considerable financial benefits which they receive. A．acts
B．jobs
C．activities
D．uses
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