Uzupełnij zdania właściwą formą czasowników w nawiasach. 

1. They were getting bored in the museum when they _____________________ (see) a painting by da Vinci.

2. Lee found a wallet when he ______________________ (jog) in the park.

3. When I ______________________ (join) the match, the team was losing.

4. They ______________________ (drive) to the airport when they ran out of petrol.

5. Imogen was peeling the potatoes while I ______________________ (cut) the onions.

6. While Nigel was crossing the street, he ______________________ (meet) an old friend.

7. Joy was making a call when her battery ______________________ (go) dead.