The man put out the cigarette when _______thatsmokingwasnotallowedonthetrain

I still remember the sitting-room _______ my mother and I used to sit in the evening．

He paused to ______ his notes, and then went on with his speech according to the main points.[ ]

Hasn’t the thief admitted his crime by now?— No, ______ questioned many times.

Where are you, Linda——I’m ____a vacation in Beijing.