I know that it was wrong of me to upset Mark
should
I know that I .................... Mark upset
There is no way that my sister wrote this letter
possibly
This letter .................... by my sister
Because of the snow we could not get to the gig
prevented
The .................... the gig
I have been too busy to watch the movie you sent, but I will do it soon
round
I .................... the movie you sent, but I will do it soon
Peter's card never arrived, so it's possible he forgot to post it
not
Peter .................... the card, because it never arrived
They didn't fix the computer problem, even though they said they would
supposed
They .................... the computer working again but they did not