A、File idea occurred to him when he went shopping yesterday. B、He got the idea when he was on his way back yesterday. C、He had t

W: Hello. What’s all this then, Harry?
M: What’s all what? I’m making a cake.
W: Yes. We can see what you’re up to. Obviously you’re making a cake. What else would you be doing with a cake tin and a rolling pin on the table and the place absolutely covered in flour? Yes, we can see what you’re doing. But why are you doing it?
M: Well, I just decided I’d try and make one for a change instead of buying one. Anyway this is going to be a rather special sort of cake. You can’t buy them like this. And while you’re here, Doris, do you mind beating up half a dozen eggs in that blue bowl over there? You’ll find a fork and egg whisk, whichever you prefer, in the drawer on the left.
W: OK. I don’t mind. But what’s so special about this cake?
M: It’s a surprise cake.
W: A surprise cake?
M: Yes. Doris, don’t forget to add five spoons of sugar.
W: No, dear. But tell us about this surprise cake.
M: Well, it was an idea I had while I was lying in bed last night.
W: Do you usually think of food in bed?
M: I wasn’t thinking of food. I decided to have a party for some old friends of mine, but I want to give them a surprise.
W: What kind of surprise?
M: Can you add a half of a pint of cream to that, Doris? That’s right, drip it in slowly and then beat it up again until it becomes all sticky. That’s the way.
W: I have made a cake before, you know. Now, come on, what’s the surprise?
M: Well, it’s quite simple, really. You see, I serve the cake with candles on it. Then I switch out the lights and I slip out of the room. But before this I tell them that they must count to twenty before trying to blow out the candles and they’ll get a surprise.
W: And then?(Explosion effect)