To be honest, I didn’t______ him at first sight. About an hour later, I remembered him.

 —How long has this bookstore been in business? —_______ 1996.

---- What’s that noise?       ---- Oh, I forgot to tell you. The new machine ______.

— Do you remember the first time we met?—At that time you ______us a lecture.

It can be proved that Diaoyu Islands ______ part of the territory(领土) of China since ancient times.