____ the temperature falling so rapidly, we couldn't go on with the experience.
I ________ thank you too much for all your help to my son while we were away from home.
No one ________ be more generous; he has a heart of gold.
He did not regret saying what he did but felt that he________it differently.
—I left my handbag on the train, but luckily someone gave it to a railway official. —How unbelievable to get it back! I mean, someone ________it.
They ________have arrived at lunchtime but their flight was delayed.