3 Complete the sentences with the correct form of the verbs in brackets.
1 I wouldn't have bought this CD if I ... (know)
it was damaged.
2 If you had asked, I... (help) you.
3 If people ... (not pollute) the river, the fish wouldn't
have died.
4 Would you have known about freegans if you ...
(not read) the article?
5 If people hadn't protected the blue whales, they .
(not survive).
6 If people had realized about the effects of global
warming, ... (they / use) more renewable energy?​

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