（）that the demand for power continues to rise at the current rate, it will not be long before traditional sources become inadequate.

The person who （）this type of approach for doing resear...

单项选择题The person who （）this type of approach for doing research deserves our praise.

With prices （）so much, it is difficult for the school t...

单项选择题With prices （）so much, it is difficult for the school to plan a budget.

Many types of rock are （）from volcanoes as solid, fragm...

单项选择题Many types of rock are （）from volcanoes as solid, fragmentary material.