past indefinite или past continuous: 1.john (to write) the label when the bell (to ring) and a short man (to enter). a dog (to follow) him. 2.there (to be) silence while the man (to look) john up and down. 3.i (to see) the light in your windows as i (to pass). 4.during the dinner while he (to eat) his piece of cold meat, his aunt (to help) herself to wine. 5.while he (to read) a newspaper she (to sit) studying him, and by the look in her eyes he (to see) that she (to reflect) on something concerning him. 6.jim half (to dream) still when he (to come) 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

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.