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.