She keeps a supply of candles in the house in case of power _________.
As you get older, your _______ towards the matter will change.
–Have you finished your experiment report, Jane? --Oh, my god! I’ve _______ forgotten all about that.
We should consider what use can we make ______ such material.
He commanded the students ______ the classroom before he returned.
–How about _______ Christmas evening party? _ I should say it was _______ success.