`1.` called / wasn't / was studying
`2.` didn't hear / was slepping
`3.`was shining / were singing
`4.`were talking / walked
`5.`weren't / were playing
`6.`fell / was reading
`7.`was snowing / was shining
`8.` was shoveling / brought
`9.` had/was driving / hit
`10.` decided / were starving
`11.` were waiting / arrived
`12.` was swimming / saw
`13.` Were/playing / started
`14.` were driving / stopped
`15.` was blowing / went