The police ____ still not sure ______ the young man killed himself or was killed.

He had to retire(退休)early         poor health.

—Where’s my cat, Bill? —There aren’t any cats here, ___________ there’s a little dog.

— May I go to the concert with you?— I’m afraid not ______ you have a ticket, because I have only one.

 ---Hi! Long time no see.---Yes. It’s almost three years_____ we met last time.