Помогите, пожалуйста!!!

1. A lot of trees have been broken by teenagers.

2.  Our rivers  has been polluted by factors and plants.

3 The words "I love Helen"  have been  written on the tree by Tom.

4. A lot of litter  have been dropped  in the forest by these children.

5. 30 kilograms of waistpaper have been collected  by the pupil of 9 A.

1b, 2a, 3a, 4a, 5b, 6c, 7d