1) Having read a lot of books on this question, he was able to make a very interesting report.
2) Entering the room he saw several friends waiting for him.
3) Having worked at the report the whole day, he left very tired.
4) He left, saying that he would be back soon.
5) Taking off his coat and his hat, he went upstairs.
6) Having slept a few hours, he felt well again.
7) He showed us the list of goods exported by this organisation.
8) The railway line connecting this village with the town was built last year.
9) Books published for children are usually very well illustrated.
10) He sat the table looking through the correspondence received the day before.
2 isn't/ was/ is
3 were/ are
4 was/ were
5 is/ was