They believed that Darwin’s theory of struggle for survival also ______ (applies to; applies for) human society.
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I don’t have that kind of money. I have to ______ (applies to; applies for) a scholarship.
However risky it is we must do everything in our ______ (power; strength) to carry out this order.
By that time I was beginning to lose hope, but he ______ (insisted; persisted) that if we ______ (insisted; persisted) in our struggle, we would succeed.
A big economy does not mean a powerful economy. A powerful economy must have high ______ (productivity; production) rather than high ______ (productivity; production).