Choose the correct verb form

1. I won because I [had played|had been playing] this computer game before, and I knew how to play it.
2. The children's clothes were dirty. They [had played|had been playing] in the garden.
3. Larry [had read|had been reading] this book three times, but he couldn't understand it.
4. I was scared because I [hadn't ridden|hadn't been riding] a motorbike before.
5. I [had walked|had been walking] all morning, so my feet hurt in the afternoon.
6. Sandra was very tired. She [had worked|had been working] in the garden all day.
7. She [had cried|had been crying] all night.
8. She was happy because she [had passed|had been passing] her driving test.
9. George was a wise man because he [had travelled|had been travelling] a lot when he was young.
10. Mary [had travelled|had been travelling] for three months, and she didn't want to stop.