Directions: The question below has two blanks, each blank indicating that something has been omitted. Choose the set of words for each blank that best fits the meaning of the sentences as a whole.
Drawing attention to the pitfalls of ___________ solely on Uranium as a fuel for nuclear reactors, Indian scientists warned that Uranium will not last for long and thus research on Thorium as its _______ must be revived.
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using, substitute
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believing, replacement
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depending, reserve
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relying, alternative
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reckoning, option
D
Correct answer
Explanation
The sentence talks about the supply of Uranium not lasting for long. So, scientists are warning against depending or relying on Uranium totally as a fuel to nuclear reactors. As the supply will not last, research on the alternative, Thorium, needs to be revived. Option 3 has 'depending' which is correct, but 'reserve' (or stock for emergency) does not fit the context. So, only option 5 satisfies the criteria.