______ people in our city knew David ten years ago, but now he is very famous.

oung men want to find true love on the Internet, I think is very funny.

They are still very cautious about ________ side effect the new medicine will bring about, although the experts have tried it on about 2000 patients．

This is the first time that I ______ the song Gangnam Style

He was looking for his gloves all morning ,which turned up_________ under the sofa.