1_ I first met him when I was travelling around South Africa.
2_ When I went off the bus, I broke my wallet.
3_ The bell rang while I was having a shower.
4_ The accident happened while we were visiting Tokyo.
5_ Someone stole my luggage while I was waiting for the bus.
6_ She ... me just as I ... her letter.
7_ Funny, but everything went wrong as soon as I called her.
8_ I bought three pounds of apples and an apple-pie.
9_ We were driving through Rome when our car broke down.
10_ When I saw her she was talking to her neighbour.
I don't know if everything is right but I hope it helped you :)