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12.
the soil is too dry, many kinds of trees can't grow here.
A. Owing to i9)ibBidue to C. Since rD. because of:re
in skin cancer.
13. Holes in ozone layer can
result
C. cause
A. lead de t B . d
14. People
this area.
I Pmakev.ce)
an airport in
suffer from noise pollution if they
isd gn
C. won't built
ire
D Wouldn't build
A, will/build
B. will/built
all-waste more carefully, dangerous chemicals
get
15. If we
into our water supply. wore o ye iir mia ai aiivod.cml.mE.
A. treated/ would B. treat/ would
C. treated/.won't D. treat/ won't-