Could it be in the classroom_____ we had a talk last night _____you left your keys?

When the boss came in, these workers pretended to________ carefully.

I often see her _______ the piano. Listen, can you hear her_________ the piano now

ing to spend the summer vacation in Shanghai, _______ lives my grandmother and some other close relatives.

The car damaged in the accident can’t be used unless ______ completely.[ ]