Complete the sentences with the correct form of the verbs. Use Past Simple or Past Continuous

1. Amy [ ] when Sam [ ] to buy some flowers.
2. I [ ] towards the train station when the train [ ].
3. Helen and Ben [ ] the window of the candy shop while they [ ] with a ball in the garden.
4. I [ ] my keys on the floor while I was looking for the wallet.
5. I [ ] a beautiful blue bird on the tree when I [ ] for my friend.