Chinese learners tend to use the pronoun “it” without clearly referring to an immediately preceding noun. In English we normally use “this” or a noun phrase instead.
In example 1, “it” can only refer to an immediately preceding noun (“the top”). If we substitute “it” by “this”, we are referring to an issue raised in the previous sentence (“The study says the life satisfaction of Swedish people is also at the top.”).
 

 

WRONG
RIGHT

1.

The study says the life satisfaction of Swedish people is also at the top. It proves that creativity affects technological development and talent growth and ultimately influences people’s happiness and the quality of their lives.

The study says the life satisfaction of Swedish people is also at the top. This proves that creativity affects technological development and talent growth and ultimately influences people’s happiness and the quality of their lives.

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