You have to choose the correct Past Continuous Tense or Past Simple Tense form of the verbs.
When I ___ \(open\) the front door I ___ \(see\) a girl who ___ \(hold\) a kitten in her hand.

• opened/saw/was holding
• opened/were seeing/held
• was opening/saw/was holding
• were opening/was seeing/held
• opend/saw/held