Rewrite the sentences so that it has similar meaning to the first

Rewrite the sentences so that it has similar meaning to the first.

1. “They are doing an experiment”

->He said that ………………………………..

2. “ You have to sign the paper again”

->She told me…………………………………………………….……………………

3. Acid rain is dangerous. Trees’ leaves are damaged( because of)

 ->Because of ......................................................................................................................

4.They built this house yesterday

->This house  ......................................................................................................................

5. “Do you go for a walk every day ? ” :He asked me

=> He asked ........................................................................................................................