[originaltext]W: Mary missed her class again, didn’t she?M: Well, she went to

W: Mary missed her class again, didn’t she?
M: Well, she went to the 9 o’clock lecture that lasted for one hour, but she left when it was half over.
Q: When did Mary leave?

M: Well, this is a pleasant surprise. It seems to me we ran into each other here last week too.
W: You and I must have the same idea. The only way to beat the crowds when you do the grocery shopping on Saturday is to be here when they open at 9:00 o’clock sharp!
Q: Why did both of them do grocery shopping at 9:00 o’clock sharp?