单项选择题
（）that the demand for power continues to rise at the current rate, it will not be long before traditional sources become inadequate.
A．Concerning B．Ascertaining C．Assuming D．Regarding
单项选择题 The person who （）this type of approach for doing research deserves our praise.
单项选择题 With prices （）so much, it is difficult for the school to plan a budget.
单项选择题 Many types of rock are （）from volcanoes as solid, fragmentary material.
