ENGLISH
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Simple:
- he (think) ===> he thinks
- he (be) ====> he is
The sentence is thus 
He <u>thinks</u> that he <u>is</u> clever.
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Answer:
Digital History. Mark Twain called the late 19th century the "Gilded Age." By this, he meant that the period was glittering on the surface but corrupt underneath.
Explanation:
<span>No longer than one or two sentences. If you write more than this, it'll drain out the evidence that supports the main idea. It could also be shorter if possible.</span>