I always forget some news . I am very upset. and don' t know _______ . A. how to do. B. when to do. C. what to do .
--- Is this your bike? --- No,________It's________bike.
Beth isn't my sister.________my cousin.
--- Can you spell your name, please? --- Yes, I _________.
The ruler_______on the bed. It’s on the floor.
The picture is__________the wall.