1.people need to breathe.if they don't breathe ,they(1)............die.but how clean is the air people breathe (2)..........air,they 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 cần also make our earth warmer.
1,a,won't. b,are.c,must.d,will
2. A clean. B fresh. C dirty. D cleaner.
3. A clean. B safe. C dirty. D polluted
4. A make. B made. C get. D give
Loga
Sinh Học lớp 12
