I.
a. is polluted
b. are modern
c. are clean
d. are busy
e.are valuable
f. am hungry
g. are fat
h. is important
II.
a. are having
b. am not going
c. is travelling
d. is coming/ is she ariving
e. are building
f. am cooking
III.
a i am washing my hair now
b the sun is shining
c. she is reading the magazine at the moment
d. are you writing the letter?......
e. why are you running? ....
f. do you feel tired ?
IV.
a b. is getting
c becomes
d e.gets
f. becomes
g.get
8 9 gets
10. becomes
V.