Circle the correct variant.
1) First John took a shower then he had / was having breakfast. 2) We were preparing for the
concert while our classmates decorated / were decorating the classroom. 3) My grandfather
had / was having a bike when he was a little boy. 4) Den prepared / was preparing the report
when his friend telephoned him. 5) We were walking through the forest when it suddenly
started / was starting to rain. 6) The secretary typed / was typing some documents at 3 o'clock
yesterday. 7) I understood / was understanding the main idea of the plan. 8) Tom and Den
were putting a tent while Sam and Peter made / were making a fire.