Past Continuous or Past Simple

While Captain Haddock (walk) down the stairs, he (fall) !

While Captain Haddock was walking down the stairs, he fell!

Tintin (hike) when he (see) the Yeti!

Tintin was hiking when he saw the Yeti!

While Tintin and Snowy (sail), they (discover) the Black Island

While Tintin and Snowy were sailing, they discovered the Black Island

Thomson (run) when he (be) hit in the face!

Thomson was running when he was hit in the face!

As they (read), Tintin and Snowy (be) surprised.

As they were reading, Tintin and Snowy were surprised.

Nestor (clean) when somebody (ring) the bell

Nestor was cleaning when somebody rang the bell

Tintin and Haddock (ride) camels when they (hear) gun shots!

Tintin and Haddock were riding camels when they heard gun shots!

As Bianca Castafiore (sing), a glass (break) !

As Bianca Castafiore was singing, a glass broke!

While Professor Calculus (rollerskate), he (slip) !