The ordinary girl sat silently at the corner , but when the prince came over to invite her to dance , her face immediately ____________.
---Where did you come across our chemistry teacher ? --- It was in the supermarket ______I purchased mooncakes.
________ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
—I’m really hungry now.That’s because you have left your lunch __________.
— How much do I owe you for this supper?— _________. It’s nothing.
When Marx was in London, he _______ read at the library for hours.