Переведите прямую речь в косвенную:
1) (One evening) a scientist club invited him, "Could you give a lecture for our club members?"
2) (When he left the house, he forgot to take his key with him, and he didn't notice it until he was on his way home again) "It's lucky that my wife is at home," he thought.
3) "The professor isn't at home" - she said.
4) He said, "Oh, I'm sorrym I'll come another time."