People need to breathe. If they don’t breathe, they …(1)…….die. If they breathe (2)….. air, they will have breathing problems and become ill. Plants (3)…… animals need clean air, too. A lot (4)….. the things in our lives create harmful gases and make the air dirty. Dirty air is called “ (5)….. air”.
1. A.will B.are C.must
2. A.clean B.fresh C.dirty
3. A.but B.and C.so
4. A.in B.of C.on
5A.pollute B.polluting C.polluted
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Đáp án :
1 A.will
2 C.dirty
3 B. and
4 B.of
5 C.pulluted
1.A
2.A
3.B
4.A (?)
5.C (?)