单项选择题

One reason for the success of Asian immigrants in the U.S. is that they have taken great ______ to educate their children.

A．efforts
B．pains
C．attempts
D．endeavors
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单项选择题
Key resources are technical personnel and aircraft spare parts which account for the largest share of the maintenance ______.
A．expenditure
B．budget
C．allowance
D．investment
单项选择题
Material choices such as timber and steel also help to keep the house cool, while light colours have been used on the exterior surfaces to ______ heat and blend in with the surrounds.
A．compel
B．repel
C．propel
D．expel
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