1) I had a very good time there and I am full of impressions.
2) "Father, the man has come again " said the girl. (тот же человек снова)
3) Summer is the hotest season of the year.
4) Airports are usually near the centre of a city.
5) When I got up and went out of the room I didn't know whether it was night or morning.
Во втором может также быть: "Father, a man has come again," said the girl. (опять какой-то человек)