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The relative pronoun which is a correct alternative for “who” in “centenarians who neither smoke nor drink” (line 15).
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“this”, in “this small community” (lines 14 and 15), is the singular form of these.
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A synonymous word for “thus”, in “It is thus widely believed” (lines 16 and 17), is therefore.
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If is not a correct alternative for “Whether” in “Whether this is going” (line 24).
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“Although” in “Although they differ” (line 2) can be correctly replaced by though.
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Without a wireless adapter, it is not possible to connect a Smart TV to the Internet.
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Some decades ago, watching TV depended on different factors, including the weather.
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In the 1970s, it was only possible to watch local TV programs.
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The variety of TV programs was much greater after the 1970s.
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Smart TVs have been popular for many decades.