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VI. Choose the correct answer A, B, C or D to complete the passage.
People need to breathe. If they don't breathe, they (1)............... die.
air, they
But how clean is the air people breathe? If they breathe (2)
will have breathing problems. Plants and animals need (3)............... air too.
A lot of the things in our lives create harmful gases and (4).............. the
air dirty, like cars, motorbikes, and factories. Dirty air is called polluted
air. Air pollution can also make our Earth warmer.
1. A. won't
2. A. clean
3. A. clean
4. A. make
B. are
B. fresh
B. safe
B. get
C. must
C. dirty
C. dirty
C. give
D. will
D. cleaner
D. polluted
D. made