1. John was writing the label when the bell rang and a short man entered. A dog followed him.
2.There was silence while the man was looking John up and down.
3.I saw the light in your windows as I was passing.
4.During the dinner while he was eating his piece of cold meat, his aunt helped herself to wine.
5.While he was reading a newspaper she was sitting studying him, and by the look in her eyes he saw that she was reflecting on something concerning him. В этом предложении расстановка времени полностью зависит от смысла, который автор хочет передать. Я написал самый простой вариант. Думаю этого будет достаточно.
6.Jim was half dreaming still when he came to the place of his destination.
1. was writing; rang; entered; was following
2. was; was looking
3. saw; was passing
4. was eating; was helping
5. was reading; was sitting; saw; was reflecting
6.was dreaming ; came