Question

b. We know that pollution
(become) a threat to our survival.
Before the industrial Revolution in the 19 century, people lived more in harmony with
their immediate environment. With the spread of industrialization, the problem of
pollution
(increase). When the Earth's population was much
smaller, no one believed pollution would ever present a serious problem. With
the increasing population on the planet, it ..................... ......... (become) apparent
that there are limits. Pollution is one of the signs that humans........
exceed) those limits




this is the question of english grammer verb:perfect tense​

Answer 1

Answer: has become

exceeded

Answer 2

Answer:

Has become

had exceeded

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