My father’s sister is my __________.

_____ is certain is ______ the mystery of Stonehenge has never been fully explained.

Do you know when ____ I miss him very much.—Don’t worry. I will tell you as soon as ____.

The professor ______ sit in his study for hours when he worked on the new project.

Tom, where’s your dad—Oh, mum, he _____ his bike in the yard.