Solve this :

Q.7  The following passage has not been edited. There is an error in each line. Correct the word and write in the space provided.

There have been many reports in the past       
for the beneficial effect of music on                        (a) _______________________
plants. It has being found that trees                        (b)  ______________________
produce many crops, plants and                            (c)  ______________________
flowers for constant                                              (d)  _____________________
exposed to music. Therapists                                 (e)  _____________________
treated mentally ill patients