Fill each blank with one suitable word by choosing A, B or C.
People need air to breathe. In order to keep us healthy, we need (31) _____ air. However, nowadays, (32) _____ lot of things in our lives create harmful gasses and make the air dirty, like factories, cars and motobikes. Air (33) ______ is one of the worldwide alarming issues nowadays. It causes not only (34) ______ problems in people but also in plants and animals. It’s our responsibility to keep the air (35) _____.
31.
-
A
clean
-
B
dirty
-
C
polluted
32.
-
A
the
-
B
a
-
C
an
33.
-
A
polluted
-
B
pollute
-
C
pollution
34.
-
A
healthy
-
B
unhealthy
-
C
health
35.
-
A
polluted
-
B
unpolluted
-
C
harmful