Question

Choose the correct verb form:
1)He was working/worked in a store, when she was coming/came in.
2)While he was living/lived with Cathy Kelly, he was meeting/met Josephine.
3)Cathy Kelly was having/had a party when she was introducing/introduced Nguyen to her.
4) She was doing/did the shopping when he first was seeing/ saw her.

Answer 1

1) He was working in a store when she came in.
2) While he was living with Cathy Kelly he met Josephine.
3) Cathy Kelly was having a party when she introduced Nguyen to her. 
4) She was doing the shopping when he first saw her. 
( Sper ca e bine :) )  

Answer 2

He was working in a store,when she came in.
While he was living with Cathy Kelly,he met Josephine
Cathy Kelly was having a party when she introduced Nguyen to her
She was doing the shopping when he first saw her