1.

1). Gigantic, contested2). Fascinating, suppressed3). Thrilling, forced4). Astounding, endured

Answer»

The context suggests that the FIRST blank should contain an adjective that means 'great', to correspond to the engineering 'achievement'.

Astounding means impressive. Enervating means DRAINED of energy.

Most of the options can fit the first blank to MAKE the sentence meaningful.

The SECOND blank should contain a verb that means 'witnessed'. This is only given by 'endured', meaning 'suffered'.

Therefore, the correct answer is OPTION 4.



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