Question

1.this is the first time I've ever painted a mural over graffiti.

I have 
4.They haven't cleaned up the street forr five months.

It's................................

5.We have donated books and clothes for ten years.

We began.

6, John has not had his hair cut for over six months→→It is

Answer 1

1.this is the first time I've ever painted a mural over graffiti.

I have not painted a mural over graffifti before 
4.They haven't cleaned up the street forr five months.

It's....the first time I have cleaned up the street ............................

5.We have donated books and clothes for ten years.

We began.donating books and clothes for ten years.

6, John has not had his hair cut for over six months

The last time John has cut his hair was six months ago

Answer 2

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5.We have donated books and clothes for ten years.

We began donating books and clothes 10 years ago

6, John has not had his hair cut for over six months

→→It is over six months since John last had his hair cut

(The last time John had his hair cut was 6 months ago)