Use present perfect passive 1) new playgrounds (build) in our street 2)many trees (plant) in the central park 3) some shops (build) during the last years 4)the number of cars (grow) in our town 5) the local river (pollute) with chemicals

1) New playgrounds (have been built) in our street.
2) Many trees (have been planted) in the Central Park.
3) Some shops (have been built) during the last years.
4) The number of cars (has grown) in our town. здесь страдательный залог неуместен
5) The local river (has been polluted) with chemicals.

) New playgrounds  have been built (build) in our street 2)many trees have been planted (plant) in the central park 3) some shops have been built  (build) during the last years 4)The number of cars  has been grown (grow) in our town 5) the local river has been polluted  (pollute) with chemicals