Сpast indefinite и past continuous ! 1)they a lot of interesting things when they in the south (to see, to travel) 2)the students when the (to shout, to come) 3)we supper when the (to have,ring) 4) it when we the village.(to rain,to get)

1) They saw a lot of interesting things when they were travelling in the South 
2) The students were shouting when the teacher came
3) We were having supper when the telephone rang
4) It rained when we were getting to the village 

1. They saw a lot of interesting things when they were travelling in the South.
2. The students were shouting when the teacher came. 
3. We were having dinner when the telephone rang.
4. It was raining when we got to the village.