Do you know the Water Cube（水立方）at all? — No, this is the first time I _________ here.

You have a nice watch. — Thank you. I _______ it since two years ago.

______ does Mary go to the Bubby Club? — Once a week. [ ]

It is terrible. The cat miaowed a lot at night recently. It _________ a baby crying.

The professor has given us _______________ advice on how to improve our memory.