________ you call me to say you’re not attending my birthday party, I’ll see you at it.[ ]

What are you doing _____ vacation

My grandmother ________ in Yangzhou. She was born there and has never lived anywhere else.

Sam_______ some knowledge of the computer just bywatching others working on it..

Have you ever ________ to Qingdao There is ______ aquarium at the seaside.