There are certain _______when you have to interrupt people who are in the middle of doing something.
In 1927 Benjamin Franklin founded one of the first adult-education organizations, ____ the Junto.
_________ an old woman,the room was empty.
—Where is your sister?—She’s gone away __________ the weekend.
She doesn’t know anyone here.She has got __________ to talk to.
He __________ his sight ten years ago.Since then he has been blind.