1 * Match clauses (1-6) to clauses (a-f) to make
zero conditional sentences.
1 We produce carbon dioxide
2 I always take a book
3 If we recycle our rubbish,
4 If we burn rubbish,
5 If I have a headache,
6 Water boils
a I usually take an aspirin.
b if I go on a long journey.
cwe pollute the air
d if we burn fossil fuels.
e if you heat it.
f we reduce pollution,
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